Metal Sentence Examples

metal
  • The porch posts were black metal with a filigree design.

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  • After that, metal was too important to waste.

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  • She returned with two raw steaks on a metal platter.

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  • They called him metal man.

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  • The heavy metal box grated towards her.

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  • She went to a cabinet and returned with a metal tray and a knife.

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  • You're metalman29—a metal collector.

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  • Her fingers worked across the hard metal seat and under.

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  • Brady entered the code from his micro onto the keypad beside the metal door in front of him.

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  • Three stories tall, the old mill stood picturesquely at the edge of the river, an old metal one-lane bridge at one side beckoned travelers to visit the lush pastures on the other side.

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  • The scent of charred flesh and metal still lingered, and Lana covered her mouth and nose with her hand as she started forward again.

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  • Maybe 'metalman' is some sheet metal worker or some heavy metal rocker.

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  • It was only moments later when his fears were realized by the gnashing, booming, ripping sound of metal on rock, echoing across the valley like a clap of thunder, repeating and repeating, as if car after car had met a similar fate, further and further away.

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  • She opened the door to her tiny room, taking in the two twin beds with sagging metal frames.

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  • Her fingers grazed the cold metal, and she stretched towards it.

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  • A man opened the metal door and another entered with a tray holding two large, silver goblets.

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  • In the middle, Elisabeth sat in a metal chair, barely conscious.

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  • He led her down a set of stairs and through a thick metal door at the bottom.

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  • The keys which hold the rail in the chairs are usually of oak and are placed outside the rails; the inside position has also been employed, but has the disadvantage of detracting from the elasticity of the road since the weight of a passing train presses the rails up against a rigid mass of metal instead of against a slightly yielding block of wood.

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  • Such metal plates, or " tie-plates," have come into considerable use also in the United States, where they are always made of rolled steel, punched with rectangular holes through which the spikes pass.

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  • The rail-failures mentioned above also drew renewed attention to the importance of the thermal treatment of the steel from the time of melting to the last passage through the rolling mill and to the necessity of the finishing temperature being sufficiently low if the product is to be fine grained, homogeneous and tough; and to permit of this requirement being met there was a tendency to increase the thickness of the metal in the web and flanges of the rails.

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  • The standard specification adopted by the Pennsylvania railway in 1908 provided that in rails weighing Ioo lb to the yard 41% of the metal should be in the head, 18-6% in the web, and 40-4% in the base, while for 85 lb rails 42.2% was to be in the head, 17-8% in the web and 40.0% in the base.

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  • According to the specification for 85 lb rails adopted by the Canadian Pacific railway about the same time, 36-77% of the metal was to be in the head, 22'21% in the web and 41 02% in the base.

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  • He now employed himself in making optical glasses, and in engraving on metal, devoting his spare time to the perusal of works on mathematics and optics.

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  • Manufactures based on the products of mines and quarries (chemicals, glass, clay, stone and metal works) constituted about one-fifth of the whole product.

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  • In the presidential election of 1900 the Nevada Republicans pursued a non-committal policy with regard to the silver question, declaring in favour of " the largest use of silver as a money metal in all matters compatible with the best interests of our government."

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  • The sistrum is played also by beating it with a metal stick.

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  • The metal may be obtained from the residues obtained in the separation of osmium from osmiridium.

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  • Acids have practically no action on the metal, but it is soluble in solutions of the alkaline hypochlorites.

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  • Ruthenium sulphides are obtained when the metal is warmed with pyrites and some borax, and the fused mass treated with hydrochloric acid first in the cold and then hot.

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  • Potassium ruthenate, K2Ru04 H20, obtained by fusion of the metal with caustic potash and nitre, crystallizes in prisms which become covered with a black deposit on exposure to moist air.

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  • Ponce's hospitable reception by the native chief, Aquebana or Guaybana, and his fairly profitable search for the precious metal led King Ferdinand in 1509 to give him an appointment as temporary governor of the island, where his companions had already established the settlement of Caparra (Pueblo Viejo, near the present San Juan).

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  • The mines once produced 3000 tons of metal annually, copper smelting being largely carried on, but have now almost ceased working.

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  • He established as fundamental that combustion and calcination were attended by an increase of weight, and concluded, as did Jean Rey and John Mayow in the 17th century, that the increase was due to the combination of the metal with the air.

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  • He also showed that on heating mercury calx alone an " air " was liberated which differed from other " airs," and was slightly heavier than ordinary air; moreover, the weight of the " air " set free from a given weight of the calx was equal to the weight taken up in forming the calx from mercury, and if the calx be heated with charcoal, the metal was recovered and a gas named " fixed air," the modern carbon dioxide, was formed.

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  • Gold, the most perfect metal, had the symbol of the Sun, 0; silver, the semiperfect metal, had the symbol of the Moon, 0j; copper, iron and antimony, the imperfect metals of the gold class, had the symbols of Venus Mars and the Earth tin and lead, the imperfect metals of the silver class, had the symbols of Jupiter 94, and Saturn h; while mercury, the imperfect metal of both the gold and silver class, had the symbol of the planet,.

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  • A base may be regarded as water in which part of the hydrogen is replaced by a metal, or by a radical which behaves as a metal.

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  • An acid salt is one in which the whole amount of hydrogen has not been replaced by metal; a normal salt is one in which all the hydrogen has been replaced; and a basic salt is one in which part of the acid of the normal salt has been replaced by oxygen.

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  • Peligot, who prepared the pure metal, that Klaproth's product was really an oxide.

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  • In the same year as Klaproth detected uranium, he also isolated zirconia or zirconium oxide from the mineral variously known as zircon, hyacinth, jacynth and jargoon; but he failed to obtain the metal, this being first accomplished some years later by Berzelius, who decomposed the double potassium zirconium fluoride with potassium.

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  • In the following year he announced that silica was the oxide of a hitherto unrecognized element, which he named silicium, considering it to be a metal.

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  • Matthiessen in 1855, who obtained the metal by electrolysis and thoroughly examined it and its compounds.

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  • If the crystal structure be regarded as composed of 0 three interpenetrating point systems, one consisting of sulphur atoms, the second of four times as many oxygen atoms, and the third of twice as many potassium atoms, the systems being so arranged that the sulphur system is always centrally situated with respect to the other two, and the potassium system so that it would affect the vertical axis, then it is obvious that the replacement of potassium by an element of greater atomic weight would specially increase the length of w (corresponding to the vertical axis), and cause a smaller increase in the horizontal parameters (x and 1/ '); moreover, the increments would advance with the atomic weight of the replacing metal.

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  • The stone knives, arrowheads, celts, hoe-blades, hammers, nails, awls, etc., associated with this pottery are of kinds which though simple and often crude in type are nevertheless not early, but date from the transition period to the age of metal and the earliest centuries of the latter period.

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  • We see however the similarity of the metal-working of both countries at approximately the same time; both are in the same style of artistic development, the Egyptian perhaps the more advanced of the two, and (if the published analysis by Mosso is to be relied upon) with the additional technique of the alloy with tin, making the metal bronze, and so easier for the heads to be cast.

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  • They made a greater display of brilliant metal and gorgeous colour than the Roman armies, for instance.

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  • The shell thus formed is then cut along the line of the intended equator into two hemispheres, they are then again glued together and made to revolve round an axis the ends of which passed through the poles and entered a metal meridian circle.

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  • All these globes are of metal (bronze), or they might not have survived so many years.

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  • He was distinguished as the discoverer of radioactivity, having found in 1896 that uranium at ordinary temperatures emits an invisible radiation which in many respects resembles Rntgen rays, and can affect a photographic plate after passing through thin plates of metal.

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  • Thereupon Ormazd will hold a judicium universale, in the form of a general ordeal, a great test of all mankind by fire and molten metal, and will judge strictly according to justice, punish the wicked, and assign to the good the hoped-for reward.

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  • The proportion of imports taken from the United States is greatest in foodstuffs, metals and metal manufactures, timber and furniture, mineral oils and lard.

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  • Mehner patented heating the oxides of silicon, boron or magnesium with coal or coke in an electric furnace, and then passing in nitrogen, which forms, with the metal liberated by the action of the carbon, a readily decomposable nitride.

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  • Chief among them are weaving and leather and metal work, carried on by the workmen in their own houses.

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  • There are extensive coal-fields and important iron, metal and machine industries, together with the manufacture of chemicals and corn-milling.

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  • It is some five feet long, ending at the top in a crook (volute) bent inwards, and made of metal, ivory or wood.

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  • If of metal, it is hollow; if of wood, it is usually covered with metal.

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  • The chief features of the museum are collections of the fossils, birds and flora of Wales and of obsolete Welsh domestic appliances, casts of the pre-Norman monuments of Wales, and reproductions of metal and ivory work illustrating various periods of art and civilization.

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  • Berzelius stated that neutral salt solutions could be decomposed by electricity, the acid appearing at one pole and the metal at the other.

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  • This observation showed that nascent hydrogen was not, as had been supposed, the primary cause of the separation of metals from their solutions, but that the action consisted in a direct decomposition into metal and acid.

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  • The electromotive force of Volta's simple cell falls off rapidly when the cell is used, and this phenomenon was shown to be due to the accumulation at the metal plates of the products of chemical changes in the cell itself.

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  • Thus the hydroxyl mentioned above decomposes into water and oxygen, and the chlorine produced by the electrolysis of a chloride may attack the metal of the anode.

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  • A current can be obtained by the combination of two metals in the same electrolyte, of two metals in different electrolytes, of the same metal in different electrolytes, or of the same metal in solutions of the same electrolyte at different concentrations.

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  • Plates of platinum and pure or amalgamated zinc are separated by a porous pot, and each surrounded by some of the same solution of a salt of a metal more oxidizable than zinc, such as potassium.

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  • In ordinary cells the difference is secured by using two dissimilar metals, but an electromotive force exists if two plates of the same metal are placed in solutions of different substances, or of the same substance at different concentrations.

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  • In the latter case, the tendency of the metal to dissolve in the more dilute solution is greater than its tendency to dissolve in the more concentrated solution, and thus there is a decrease in available energy when metal dissolves in the dilute solution and separates in equivalent quantity from the concentrated solution.

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  • Now the effective change produced by the action of the current is the concentration of the more dilute solution by the dissolution of metal in it, and the dilution of the originally stronger solution by the separation of metal from it.

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  • If secondary effects are eliminated, the deposition of metals also is a reversible process; the decomposition voltage is equal to the electromotive force which the metal itself gives when going into solution.

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  • The phenomena of polarization are thus seen to be due to the changes of surface produced, and are correlated with the differences of potential which exist at any surface of separation between a metal and an electrolyte.

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  • In contact with a solvent a metal is supposed to possess a definite solution pressure, analogous to the vapour pressure of a liquid.

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  • Metal goes into solution in the form of electrified ions.

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  • The liquid thus acquires a positive charge, and the metal a negative charge.

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  • When a current passes from an electrolyte to a metal, the electron must be detached from the atom it was accompanying and chemical action be manifested at the electrode.

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  • Marshall, who, in January of the same year, had found the metal near what is now Coloma, Eldorado county.

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  • It is now ready either for incorporation with sulphur and other materials, or for agglomeration into solid masses by means of the masticating machine - an apparatus which consists of a strong cylindrical cast-iron casing, inside which there revolves a metal cylinder with a fluted or corrugated surface.

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  • The principal industries are the iron and metal manufactures, chiefly centred at Steyr.

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  • In the article Electrolysis it is shown how the passage of an electric current through a solution containing metallic ions involves the deposition of the metal on the cathode.

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  • Sometimes the metal is deposited in a pulverulent form, at others as a firm tenacious film, the nature of the deposit being dependent upon the particular metal, the concentration of the solution, the difference of potential between the electrodes, and other experimental conditions.

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  • This can only be effected if the surface of the metal on which the deposit is to be made is chemically clean.

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  • Large metallic surfaces (especially external surfaces) are sometimes plated by means of a "doctor," which, in its simplest form, is a brush constantly wetted with the electrolyte, with a wire anode buried amid the hairs or bristles; this brush is painted slowly over the surface of the metal to be coated, which must be connected to the negative terminal of the electrical generator.

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  • The varnish is then removed, a different design stopped out, and another metal deposited.

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  • It should be mentioned here, however, that solutions which would deposit their metal on any object by simple immersion should not be generally used for electroplating that object, as the resulting deposit is usually non-adhesive.

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  • The colour depends in part upon the proportion of copper and zinc, and in part upon the current density, weaker currents tending to produce a redder or yellower metal.

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  • Others have arranged a means of obtaining high conductivity wire from cathode-copper without fusion, by depositing the metal in the form of a spiral strip on a cylinder, the strip being subsequently drawn down in the usual way; at present, however, the ordinary methods of wire production are found to be cheaper.

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  • During the next eight years he carried out a minute investigation of this metal and its properties.

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  • While determining its atomic weight, he thought it desirable, for the sake of accuracy, to weigh it in a vacuum, and even in these circumstances he found that the balance behaved in an anomalous manner, the metal appearing to be heavier when cold than when hot.

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  • This metal was known to the ancients, and is mentioned in the Old Testament.

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  • Galena (q.v.), the principal lead ore, has a world-wide distribution, and is always contaminated with silver sulphide, the proportion of noble metal varying from about o of or less to o 3%, and in rare cases coming up to 2 or i %.

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  • The extraction of the metal from pure (or nearly pure) galena is the simplest of all metallurgical operations.

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  • In Wales and the south of England the process is conducted in a reverberatory furnace, the sole of which is paved with slags from previous operations, and has a depression in the middle where the metal formed collects to be let off by a tap-hole.

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  • At this stage as a rule some rich slags of a former operation are added and a quantity of quicklime is incorporated, the chief object of which is to diminish the fluidity of the mass in the next stage, which consists in this, that, with closed air-holes, the heat is raised so as to cause the oxide and sulphate on the one hand and the sulphide on the other to reduce each other to metal.

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  • They are long and narrow; the sole is plane, but slopes from the fire-bridge towards the flue, so that the metal runs to the latter end to collect in pots placed outside the furnace.

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  • Charcoal is now added, and the heat urged on to obtain Pressblei, an inferior metal formed partly by the action of the charcoal on the oxide of lead.

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  • In Cumberland, Northumberland, Durham and latterly the United States, the reverberatory furnace is used only for roasting the ore, and the oxidized ore is then reduced by fusion in a low, square blastfurnace (a "Scottish hearth furnace") lined with cast iron, as is also the inclined sole-plate which is made to project beyond the furnace, the outside portion (the "work-stone") being provided with grooves guiding any molten metal that may be placed on the "stone" into a cast iron pot; the "tuyere" for the introduction of the wind was, in the earlier types, about half way down the furnace.

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  • Thus in the Moffett method it is immaterial whether metal or fume is produced, as in either case it is saved and the price is about the same.

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  • The leading products of the blast-furnace are argentiferous lead (base bullion), matte, slag and flue-dust (fine particles of charge and volatilized metal carried out of the furnace by the ascending gas current).

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  • The plant consists of two tilting oval metal pans (capacity 7 tons), one cylindrical crystallizing pot (capacity 22 tons), with two discharging spouts and one steam inlet opening, two lead moulds (capacity 31 tons), and a steam crane.

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  • Pure lead isa feebly lustrous bluishwhite metal, endowed with a characteristically high degree of softness and plasticity, and almost entirely devoid of elasticity.

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  • Pure lead is far more readily corroded than a metal contaminated with 1% or even less of antimony or copper.

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  • Dilute nitric acid readily dissolves the metal, with formation of nitrate Pb(N03)2.

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  • These salts are like those of tin; and the resemblance to this metal is clearly enhanced by the study of the alkyl compounds.

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  • Lead nitrate, Pb(N03)2, is obtained by dissolving the metal or oxide in aqueous nitric acid; it forms white crystals, difficultly soluble in cold water, readily in hot water and almost insoluble in strong nitric acid.

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  • When mixed with sodium carbonate and heated on charcoal in the reducing flame lead salts yield malleable globules of metal and a yellow oxide-ring.

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  • The metal itself is not used in medicine.

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  • Some cotton is grown, although the soil is as a whole poor; the manufactures include salt, metal vessels and stone handmills.

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  • Thus the vessels used at the Passover are "kosher," as are also new metal vessels bought from a Gentile after they have been washed in a ritual bath.

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  • If one pole of the bar-magnet is brought near the compass, it will attract the opposite pole of the compass-needle; and the magnetic action will not be sensibly affected by the interposition between the bar and the compass of any substance whatever except iron or other magnetizable metal.

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  • Many of the physical properties of a metal are affected by magnetization.

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  • The resultant magnetic field, therefore, is compounded of two fields, the one being due to the poles, and the other to the external causes which would be operative in the absence of the magnetized metal.

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  • In certain cases, as, for instance, in an iron ring wrapped uniformly round with a coil of wire through which a current is passing, the induction is entirely within the metal; there are, consequently, no free poles, and the ring, though magnetized, constitutes a poleless magnet.

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  • Thus it happens that there is no definite relation between the magnetization of a piece of metal which has been previously magnetized and the strength of the field in which it is placed.

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  • The ratio of the residual magnetization to its previous maximum value measures the retentiveness, or retentivity, of the metal.'

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  • A metal which has great retentiveness may at the same time have small coercive force, and it is the latter quality which is of chief importance in permanent magnets.

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  • In the middle part of a rod which has a length of 400 or 500 diameters the effect of the ends is insensible; but for many experiments the condition of endlessness may be best secured by giving the metal the shape of a ring of uniform section, the magnetic field being produced by an electric current through a coil of wire evenly wound round the ring.

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  • In order to attain this result it was formerly the practice to raise the metal to a bright red heat, and allow it to cool while carefully guarded from magnetic influence.

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  • This operation, besides being very troublesome, was open to the objection that it was almost sure to produce a material but uncertain change in the physical constitution of the metal, so that, in fact, the results of experiments made before and after the treatment were not comparable.

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  • By means of a simple arrangement, which will be described farther on, this process can be carried out in a few seconds, and the metal can be brought as often as desired to a definite condition, which, if not quite identical with the virgin state, at least closely approximates to it.

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  • If the wire consists of a ferromagnetic metal, it will become " circularly magnetized by the field, the lines of magnetization being, like the lines of force, concentric circles.

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  • The magnetic condition assumed by a piece of ferromagnetic metal in different circumstances is determinable by various modes of experiment which may be classed as magnetometric, ballistic, and traction methods.

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  • C is a " compensating coil " consisting of a few turns of wire through which the magnetizing current passes; it serves to neutralize the effect produced upon the magnetometer by the magnetizing coil, and its distance from the magnetometer is so adjusted that when the circuit is closed, no ferromagnetic metal being inside the magnetizing coil, the ti, magnetometer needle undergoes no deflection.

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  • If it is desired to annihilate the hysteretic effects of previous magnetization and restore the metal to its original condition; it may be demagnetized by reversals.

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  • The distinguishing feature of the first is the steepness of its outlines; this indicates that the induction increases rapidly in relation to the magnetic force, and hence the metal is well suited for the construction of dynamo magnets.

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  • The second has a very small area, showing that the work done in reversing the magnetization is small; the metal is therefore adapted for use in alternating current trans formers.

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  • On the other hand, the form of the third curve, with its large intercepts on the axes of H and B, denotes that the specimen to which it relates possesses both retentiveness and coercive force in a high degree; such a metal would be chosen for making good permanent magnets.

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  • Denoting by W the work in ergs done upon a cubic centimetre of the metal (=_fHdB or f HdI), he finds W =nips approximately, where n 47r is a number, called the hysteretic constant, depending upon the metal, and B is the maximum induction.

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  • After pointing out that, since the magnetization of the metal is the quantity really concerned, W is more appropriately expressed in terms of I, the magnetic moment per unit of volume, than of B, he suggests an experiment to determine whether the mechanical work required to effect the complete magnetic reversal i Phil.

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  • When in this condition the metal is popularly said to be " saturated."

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  • The magnetic quality of a sample of iron depends very largely upon the purity and physical condition of the metal.

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  • A very pure form of iron, which from the method of its manufacture is called " steel," is now extensively used for the construction of dynamo magnets; this metal sometimes contains not more than 0.3% of foreign substances, including carbon, and is magnetically superior to the best commercial wrought iron.

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  • The following table shows some results of other experiments in which H was believed to have sensibly the same value inside as outside the metal.

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  • Experiments with annealed iron gave less satisfactory results, on account of the slowness with which the metal settled down into a new magnetic state, thus causing a " drift " of the magnetometer needle, which sometimes persisted for several seconds.

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  • Changes Of Dimensions Attending Magnetization It is well known that the form of a piece of ferromagnetic metal is in general slightly changed by magnetization.

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  • Similar results were obtained with three different samples of the metal.

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  • For steel which has been made redhot, suddenly cooled, and then let down to a yellow temper, the critical value of the magnetizing force is smaller than for steel which is either softer or harder; it is indeed so small that the metal contracts like nickel even under weak magnetizing forces, without undergoing any preliminary extension that can be detected.

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  • Some experiments were next undertaken with the view of ascertaining how far magnetic changes of length in iron were dependent upon the hardness of the metal, and the unexpected result was arrived at that softening produces the same effect as tensile stress; it depresses the elongation curve, diminishing the maximum extension, and reducing the " critical value " of the magnetizing force.

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  • Hence the changes of volume undergone by a given sample of wrought iron under increasing magnetization must depend largely upon the state of the metal as regards hardness; there may be always contraction, or always expansion, or first one and then the other.

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  • The width of the gap may be diminished until it is no greater than the distance between two neighbouring molecules, when it will cease to be distinguishable, but, assuming the molecular theory of magnetism to be true, the above statement will still hold good for the intermolecular gap. The same pressure P will be exerted across any imaginary section of a magnetized rod, the stress being sustained by the intermolecular springs, whatever their physical nature may be, to which the elasticity of the metal is due.

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  • Thomson, who, from the results of Bidwell's observations on the magnetic deformation of cobalt, was led to expect that that metal would exhibit a reversal opposite in character to the effect observed in iron.

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  • The wire is subject to two superposed magnetizations, the one longitudinal, the other circular, due to the current traversing the wire; the resultant magnetization is consequently in the direction of a screw or spiral round the wire, which will be right-handed or left-handed according as the relation between the two magnetizations is right-handed or left-handed; the magnetic expansion or contraction of the metal along the spiral lines of magnetization produces the Wiedemann twist.

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  • And, other conditions remaining unchanged, the " sense " of any effect depends upon the nature of the metal under test, and (sometimes) upon the intensity of its magnetization.

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  • Ordinary magnetizable iron is in many respects an essentially different substance from the non-magnetizable metal into which it is transformed when its temperature is raised above a certain point.

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  • The metal to be tested was prepared in the form of a ring, upon which were wound primary and secondary coils of copper wire insulated with asbestos.

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  • The temperature was determined by a platinum-rhodium and platinum thermo-j unction in contact with the metal.

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  • The first immersion into liquid air generally produced a permanent decrease of magnetic moment, and there was sometimes a further decrease when the metal was warmed up again; but after a few alternations of temperature the changes of moment.

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  • Heusler 2 in 1903 that certain alloys of the non-magnetic metal manganese with other non-magnetic substances were strongly magnetizable, their susceptibility being in some cases equal to that of cast iron.

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  • Now iron, nickel and cobalt all lose their magnetic quality when heated above certain critical temperatures which vary greatly for the three metals, and it was suspected by Faraday 3 as early as 1845 that manganese might really be a ferromagnetic metal having a critical temperature much below the ordinary temperature of the air.

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  • Guillaume 6 explains the ferromagnetism of Heusler's alloy by supposing that the naturally low critical temperature of the manganese contained in it is greatly raised by the admixture of another appropriate metal, such as aluminium or tin; thus the alloy as a whole becomes magnetizable at the ordinary temperature.

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  • The magnetization curve was found to be of the same general form as that of a paramagnetic metal, and gave indications that with a sufficient force magnetic saturation would probably be attained.

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  • Hall Efect.-If an electric current is passed along a strip of thin metal, and the two points at opposite ends of an equipotential line are connected with a galvanometer, its needle will of course not be deflected.

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  • The tranverse electromotive force is equal to KCH/D, where C is the current, H the strength of the field, D the thickness of the metal, and K a constant which has been termed the rotatory power, or rotational coefficient.

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  • Electro-Thermal Relations.-The Hall electromotive force is only one of several so-called " galvano-magnetic effects " which are observed when a magnetic field acts normally upon a thin plate of metal traversed by an electric current.

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  • He considers that Hall's is the fundamental phenomenon, and that the Nernst effect is essentially identical with it, the primary electromotive force in the case of the latter being that of the Thomson effect in the unequally heated metal, while in the Hall experiment it is derived from an external source.

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  • Nickel when magnetized is always positive to the unmagnetized metal.

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  • Weber's theory, the molecules of a ferromagnetic metal are small permanent magnets, the axes of which under ordinary conditions are turned indifferently in every direction, so that no magnetic polarity is exhibited by the metal as a whole; a magnetic force acting upon the metal tends to turn the axes of the little magnets in one direction, and thus the entire piece acquires the properties of a magnet.

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  • In 1855, ignorant of what Wailer had done ten years previously, he succeeded in obtaining metallic aluminium, and ultimately he devised a method by which the metal could be prepared on a large scale by the aid of sodium, the manufacture of which he also developed.

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  • Debray (1827-1888) he worked at the platinum metals, his object being on the one hand to prepare them pure, and on the other to find a suitable metal for the standard metre for the International Metric Commission then sitting at Paris.

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  • But having failed, he allowed the paper, and also a second by Chevenix of the same tenor in 1805, to be read without avowing that it was he himself who had originally detected the metal, although he had an excellent opportunity of stating the fact in 1804 when he discussed the substance in the paper which announced the discovery of rhodium.

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  • In these instruments the lines are ruled upon a spherical surface of speculum metal, and mark the intersections of the surface by a system of parallel and equidistant planes, o; of which the middle member passes through the centre of the sphere.

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  • Rutherfurd introduced into common use the reflection grating, finding that speculum metal was less trying than glass to the diamond point, upon the permanence of which so much depends.

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  • As a source of light he used sunshine passing through a very small hole perforated in a metal plate, or condensed by a lens of short focus.

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  • The pyramidions were sheathed in bright metal, catching and reflecting the sun's rays as if they were thrones of the sunlight.

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  • In 1789 Klaproth isolated from pitchblende a yellow oxide which he viewed as the oxide of a new metal, which he named uranium, after the newly discovered planet of Herschel.

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  • Like Fe 2 0 3, the yellow oxide lost 48 parts of oxygen per Ur203 (= 864 parts) as water, while Ur 2 = 816 parts of metal remained.

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  • These results were adopted until Peligot in 1840 discovered that Berzelius's (and Klaproth's) metal contains oxygen, and that his (Ur 2) 0 3 really is (U606) 03= 3U 2 0 3, where U= 120 is one equivalent weight of real uranium.

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  • Peligot's results, though called in question by Berzelius, have been amply confirmed by all subsequent investigators; only now, on theoretical grounds, first set forth by Mendeleeff, we double Peligot's atomic weight, so that U now signifies 240 parts of uranium, while UO 3 stands as the formula of the yellow oxide, and UO 2 as that of Berzelius's metal.

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  • To extract the metal, the pitchblende is first roasted in order to remove the arsenic and sulphur.

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  • One method for this purpose is to convert it into a solution of the nitrate U02(N03)2, and from it to precipitate the metal as oxalate by oxalic acid (Peligot).

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  • Uranium is a white malleable metal, which is pretty hard, though softer than steel.

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  • The compact metal when exposed to the air tarnishes only very slowly.

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  • Uranous Compounds.-Uranium dioxide, UO 2 (Berzelius's metal), is a brown to copper-coloured powder, obtained by heating U308 or uranyl oxalate in hydrogen.

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  • The gold is found in minute particles arid in the richest ores the metal is rarely in visible quantities before treatment.

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  • Being a component of bronze, it was used as a metal thousands of years prior to the dawn of history; but it does not follow that prehistoric bronzes were made from metallic tin.

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  • When the unalloyed metal was first introduced cannot be ascertained with certainty.

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  • Of minerals containing this element mention may be made of cassiterite or tinstone, Sn02, tin pyrites, Cu 4 SnS 4 + (Fe,Zn) 2 SnS 4; the metal also occurs in some epidotes, and in company with columbium, tantalum and other metals.

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  • The slag and metal produced are then run off and the latter is cast into bars; these are in general contaminated with iron, arsenic, copper and other impurities.

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  • In the English process the bars are heated cautiously on an inclined hearth, when relatively pure tin runs off, while a skeleton of impure metal remains.

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  • The metal run off is further purified by poling, i.e.

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  • This operation is no doubt intended to remove the oxygen diffused throughout the metal as oxide, part of it perhaps chemically by reduction of the oxide to metal, the rest by conveying the finely diffused oxide to the surface and causing it to unite there with the oxide scum.

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  • After this the metal is allowed to rest for a time in the pot at a temperature above its freezing point and is then ladled out into ingot forms, care being taken at each stage to ladle off the top stratum.

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  • To test the purity of the metal the tin-smelter heats the bars to a certain temperature just below the fusing point, and then strikes them with a hammer or lets them fall on a stone floor from a given height.

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  • The metal is pretty soft and easily flattened out under the hammer, but almost devoid of tenacity.

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  • Iron renders the metal hard and brittle; arsenic, antimony and bismuth (up to 0.5%) reduce its tenacity; copper and lead (1 to 2%) make it harder and stronger but impair its malleability; and stannous oxide reduces its tenacity.

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  • For making tin-foil the metal is rolled into thin sheets, pieces of which are beaten out with a wooden mallet.

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  • In the absence of metallic tin there is no visible change; but, as soon as the metal is introduced, an electrolytic action sets in and the articles get coated over with a firmly adhering film of tin.

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  • The iron plates, having been carefully cleaned with sand and hydrochloric or sulphuric acid, and lastly with water, are plunged into heated tallow to drive away the water without oxidation of the metal.

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  • Precipitated stannous hydrate dissolves readily in caustic potash; if the solution is evaporated quickly it suffers decomposition, with formation of metal and stannate, 2SnO+2KOH = K2Sn03+Sn+H20.

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  • Flores stanni is a finely divided mixture of the metal and oxide obtained by fusing the metal in the presence of air for some time.

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  • Tin compounds when heated on charcoal with sodium carbonate or potassium cyanide in the reducing blowpipe flame yield the metal and a scanty ring of white Sn02.

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  • I I) is difficult to explain, though Maimonides perhaps correctly regarded the law as a protest against heathenism (on the magical use of representatives of the animal and vegetable kingdom, in conjunction with a metal ring, see I.

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  • It is not necessary for the blocks of wet guncotton to be actually in contact if they be under water, and the peculiar explosive wave can also be conveyed a little distance by a piece of metal such as a railway rail.

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  • The triazoles behave as weak bases, the imido-hydrogen being replaceable by metal.

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  • In metal mining, when the workable portions of the deposit are small and separated by unworkable areas, the levels serve also the purpose of exploration, and in such cases must not be so far apart as to risk missing valuable mineral.

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  • In metal mines, where, as a rule, mechanical haulage is inapplicable, the cars are moved by men (trammers).

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  • Animal haulage is employed chiefly in collieries and large metal mines; sometimes for main haulage lines, but oftener for distributing empty cars and making up trains for mechanical haulage.

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  • Cages of the size generally used in metal mines will hold from ten to fifteen and occasionally twenty men.

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  • In metal mines, however, artificial ventilation is rarely attempted, and natural ventilation often fails to furnish a sufficient quantity of air.

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  • The examination of the air of metal mines has shown that in most cases it is much worse than the air of crowded theatres or other badly ventilated buildings.

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  • Similar swelling ground is not infrequently met with in metal mines, as, for example, in the Phoenix copper mine in Houghton county, Michigan, where the force developed was sufficient to crush the strongest timber that could be used.

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  • On the other hand in the case of uncertain and irregular deposits, the value of which varies between very wide limits, as, for example - in most metal mines and especially mines of gold and silver - a very large number of samples must be taken - sometimes not more than two or three feet apart - in order that the average value of the ore may be known within reasonable limits of error.

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  • A fire underground speedily becomes formidable, not only in coal but also in metal mines, on account of the large quantity of timber used to support the excavations.

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  • In the metal mines of Cornwall and Devon special rules are now in force requiring the use of water in drilling, and other precautions, to lessen this danger from dust.

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  • The cock is now shut against both communications, the reservoir lifted, the gas contents of A discharged and so on, until, when after an exhaustion mercury is let into A, the metal strikes against the top without interposition of a gas-bell.

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  • The same oxide may produce different colours with different glass-mixtures, and different oxides of the same metal may produce different colours.

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  • The bowl is now severed from its blowing iron and the unfinished wine-glass is supported by its foot, which is attached to the end of a working rod by a metal clip or by a seal of glass.

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  • Flashed glass is produced by taking either the first or the last gathering in the production of a cylinder out of a crucible containing the coloured " metal," the other gatherings being taken out of ordinary white sheet-glass.

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  • It is probable that when the metal rod was withdrawn the vessel was filled with sand, to prevent collapse, and buried in heated ashes to anneal.

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  • Threads of coloured molten glass were spirally coiled round the body, and, whilst still viscid, were dragged into zigzags with a metal hook.

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  • To make a really good mirror of glass two things are required - a plate free from bubbles and striae, and a method of applying a film of metal with a uniform bright surface free from defects.

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  • Evelyn notes in his Diary a visit in 1673 to the Italian glass-house at Greenwich, " where glass was blown of finer metal than that of Murano," and a visit in 1677 to the duke of Buckingham's glass-works, where they made huge " vases of mettal as cleare, ponderous and thick as chrystal; also looking-glasses far larger and better than any that came from Venice."

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  • Most metals form carbonates (aluminium and chromium are exceptions), the alkali metals yielding both acid and normal carbonates of the types Mhco 3 and M 2 CO 3 (M = one atom of a monovalent metal); whilst bismuth, copper and magnesium appear only to form basic carbonates.

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  • All carbonates, except those of the alkali metals and of thallium, are insoluble in water; and the majority decompose when heated strongly, carbon dioxide being liberated and a residue of an oxide of the metal left.

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  • Perhaps all metals are crystalline, only the degree of visibility of the crystalline arrangement is very different in different metals, and even in the same metal varies according to the slowness of solidification and other circumstances.

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  • This term of course includes as special cases the qualities of "malleability" (capability of being flattened out under the hammer) and "ductility" (capability of being drawn into wire); but these two special qualities do not always go parallel to each other, for this reason amongst others - that ductility in a higher degree than malleability is determined by the tenacity of a metal.

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  • In the case of iron, however, this applies only if the metal is perfectly pure.

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  • What we have called plasticity must not be confused with the notion of "softness," which means the degree of facility with which the plasticity of a metal can be discounted.

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  • By an hydraulic press a pressure of 100,000 kilos was made to act upon the disks, when the metal was seen to "flow" out of the hole like a viscid liquid.

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  • By the "hardness" of a metal we mean the resistance which it offers to the file or engraver's tool Taking it in this sense, it does not necessarily measure, e.g.

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  • It has in general one value for the powdery metal as obtained by reduction of the oxide in hydrogen below the melting point of the metal, another for the metal in the state which it assumes spontaneously on freezing, and this latter value, in general, is modified by hammering, rolling, drawing, &c. These mechanical operations do not necessarily add to the density; stamping, it is true, does so necessarily, but rolling or drawing occasionally causes a diminution of the density.

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  • But in regard to their power of retaining their magnetism none of them comes at all up to the compound metal steel.

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  • The compounds formed in the first case, which may be either definite chemical compounds or solid solutions, are discussed under Alloys; in this place only combinations with non-metals are discussed, it being premised that the free metal takes part in the reaction.

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  • Arsenic combines readily with all metals into true arsenides, which latter, in general, are soluble in the metal itself.

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  • The presence in a metal of even small proportions of arsenide generally leads to considerable deterioration in mechanical qualities.

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  • The metals to be referred to are always understood to be given in the compact (frozen) condition, and that, wherever metals are enumerated as being similarly attacked, the degree of readiness in the action is indicated by the order in which the several members are named - the more readily changed metal always standing first.

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  • Aluminium is barely affected even at a white heat, if it is pure; the ordinary impure metal is liable to be very readily oxidized.

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  • There is hardly a single metal which holds out against the alkalis themselves when in the state of fiery fusion; even platinum is most violently attacked.

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  • Of the several products, the chlorides of gold and platinum (AuC13 and PtC1 4) are the only ones which when heated beyond their temperature of formation dissociate into metal and chlorine.

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  • Among the native artificers the metal workers and leather dressers are noted.

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  • Again, by raising the temperature, a metal in the solid state can be melted and liquefied, and poured into a mould to assume any form desired, which is retained when the metal cools and solidifies again; the gaseous state of a metal is revealed by the spectroscope.

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  • As the molten metal is run in, the upward thrust on the outside mould, when the level has reached PP', is the weight of metal in the volume generated by the revolution of APQ; and this, by a theorem of Archimedes, has the same volume as the cone ORR', or rya, where y is the depth of metal, the horizontal sections being equal so long as y is less than the radius of the outside FIG.

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  • Afterwards, when the metal has risen above B, to the level KK', the additional thrust is the weight of the cylinder of diameter KK' and height BH.

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  • The upward thrust is the same, however thin the metal may be in the interspace between the outer mould and the core inside; and this was formerly considered paradoxical.

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  • The characters of the syllabary were all arranged and named, and elaborate lists of them were drawn up. The literature was for the most part inscribed with a metal stylus on tablets of clay, called laterculae coctiles by Pliny; the papyrus which seems to have been also employed has perished.

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  • In 1785 appeared his Recherches theoriques et experimentales sur la force de torsion et sur l'elasticite des fils de metal, &c. This memoir contained a description of different forms of his torsion balance, an instrument used by him with great success for the experimental investigation of the distribution of electricity on surfaces and of the laws of electrical and magnetic action, of the mathematical theory of which he may also be regarded as the founder.

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  • Zinc as a component of brass (XaXKOs, 6pei-XaXKos) had currency in metallurgy long before it became known as an individual metal.

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  • Aristotle refers to brass as the "metal of the Mosynoeci," 2 which is produced as a bright and light-coloured XaXK6s, not by addition of tin, but by fusing up with an earth.

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  • Stahl, as late as 1702, quoted the formation of brass as a case of the union of a metal with an earth into a metallic compound; but he subsequently adopted the view propounded by Kunckel in 1677, that "cadmia" is a metallic calx, and that it dyes the copper yellow by giving its metal up to it.

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  • From his account it is quite clear that that metal was zinc, but he did not recognize it as the metal of calamine.

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  • The former contains a mixture of semi-solid and molten metal, which is raked out into iron ladles and cast into plates of 66 to 77 lb weight, to be sold as "spelter."

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  • The contents of the iron recipient consist of a powdery mixture of oxide and metal, which is added to the next charge, except what is put aside to be sold as "zinc dust."

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  • The men who charge and empty the retorts, those who draw and cast the metal, and those who keep the furnace in repair, need not know anything about the making or using of gas, and the men who make the gas need not know anything about a zinc furnace.

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  • Furthermore, with the large furnaces which gas-firing makes possible mechanical appliances may be substituted for manual labour in many operations, such as removing and replacing broken retorts, mixing and conveying the charge, drawing and casting the metal, charging and emptying the retorts, and removing the residues and products.

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  • It is generally recognized that the purest ores produce the purest metal.

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  • Grades of commercial zinc are usually based on selected ores, and brands, when they mean anything, usually mean that the metal is made from certain ores.

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  • Chemical control of the metal purchased is not nearly as common as it should be, and the refining of zinc is at best an imperfect operation.

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  • To obtain the metal chemically pure a specially prepared pure oxide or salt of zinc is distilled.

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  • A bath, even of very impure zinc, is allowed to stand at about the temperature of the melting-point of the metal for forty-eight or more hours, whereupon the more easily oxidizable impurities can be largely removed in the dross at the top, the heavier metals such as lead and iron settling towards the bottom.

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  • As each retort in a furnace is in all essentials a separate crucible, and as the metal from only a few of them goes into a single ingot, there can be no uniformity either in the ingots made from the same furnace during a day's run or in those made from several furnaces treating the same ore.

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  • Borchers, trace it to the presence of oxide, produced, for example, either by the use of a solution containing a trace of basic salt of zinc (to prevent which the bath should be kept just - almost imperceptibly - acid), or by the presence of a more electro-negative metal, which, being co-deposited, sets up local action at the expense of the zinc. Many processes have been patented, the ore being acted upon by acid, and the resulting solution treated, by either chemical or electrolytic means, for the successive removal of the other heavy metals.

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  • Properties Zinc is a bluish-white metal, showing a high lustre when freshly fractured.

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  • Sculpture and Carving.Sculpture in wood and metal is ol ancient date in Japan.

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  • Setting aside rude prehistoric essays in stone and metal, which have special interest for the antiquary, we have examples of sculpture in wood and metal, magnificent in conception and technique, dating from the earliest periods of what we may term historical Japan; that is, from near the beginning of the great Buddhist propaganda under the emperor Kimmei (540571) and the princely hierarch, ShOtoku Taishi (573621).

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  • The metal guard (Isuba), made of ironorpreciousalloy,wasadorned with engraved designs, often inlaid with gold and silver.

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  • The kodzuka, or handle of a little knife implanted into the sheath of the short sword or dagger, was, also of metal and engraved with like care.

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  • There is a radical difference between the points of view of the Japanese and the Western connoisseur in estimating tbe Japanese merits of sculpture in metal.

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  • The Japanes kinzoku-shi (metal sculptor) uses thirty-six principal classes 0, chisel, each with its distinctive name, and as most of thes classes comprise from five to ten sub-varieties, his cuttinl and graving tools aggregate about two hundred and fifty.

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  • There is scarcely any limit to the ingenuity and skill of the Japanese expert in diapering a metal surface.

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  • Great importance has always been attached by Japanese experts to the patina of metal used for artistic chiselling.

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  • Neither metal, when it emerges from the furnace, has any beauty, shakudo being simply dark-colored copper and shibuichi pale gun-metal.

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  • The same fundamental rule applied, too, whether the field of the decoration was silk, paper or metal.

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  • Yet another and very favorite method, giving beautiful results, is to model the design on both faces of the metal so as to give a sculpture in the round.

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  • In the surface of the metal the workman cuts grooves wider at the base than at the top, and then hammers into them gold or silver wire.

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  • Thus, for a diamond-petal diaper the chisel is carried across the face of the metal horizontally, tracing a number of parallel bands divided at fixed intervals by ribs which are obtained by merely straightening the chisel and striking it a heavy blow.

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  • The metal is then heated, not to redness, but sufficiently to develop a certain degree of softness, and the workman, taking a very thin sheet of gold (or silver), hammers portions of it into the salient points of the design.

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  • A third kind of inlaying, peculiar to Japan, is sumi-zogan (ink-inlaying), so called because the inlaid design gives the impression of having been painted with Indian ink beneath the transparent surface of the metal.

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  • The difference between this process and ordinary inlaying is that for sumi-zogan the design to be inlaid is fully chiselled out of an independent block of metal with sides sloping so as to be broader at the base than at the top. The object which is to receive the decoration is then channelled in dimensions corresponding to those of the design block, and the latter having been fixed in the channels, the surface is ground and polished until an intimate union is obtained between the inlaid design and the metal forming its field.

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  • Very beautiful effects are thus produced, for the design seems to have grown up to the surface of the metal field rather than to have been planted in it.

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  • The clay having been removed, another plate of the same metal is beaten in, and the same process is repeated.

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  • Iron was the metal used exclusively for work of this kind down to the 16th century, but various metals began thenceforth to be combined.

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  • The decorative design having been completely chiselled in the round, is then fixed in a field of a different metal, in which a design of exactly similar outline has been cut out.

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  • Microscopic accuracy has to be attained in cutting out the space for the insertion of the design, and while the latter must be soldered firmly in its place, not the slightest trace of solder or the least sign of junction must be discernible between the metal of the inserted picture and that of the field in which it is inserted.

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  • He belongs to a class of experts called uchi,nono-shi (hammerers) who perform preparatory work for glyptic artists in metal.

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  • The charm of these methods is that certain parts of the decorative design seem to float, not on the surface of the metal, but actually within it, an admirable effect of depth and atmosphere being thus produced.

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  • In this exquisite and ingenious kind of work the design appears to be growing up from the depths of the metal, and a delightful impression of atmosphere and water is obtained.

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  • Bronze is called by the Japanese kara-kane, a term signifying Chinese metal and showing clearly the source from which knowledge of the alloy was obtained.

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  • From the time when they began to cast bronze statues, Japanese experts understood how to employ a hollow, removable core round which the metal was run in a skin just thick enough for strength without waste of material; and they also understood the use of wax for modelling purposes.

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  • Many brilliant specimens of these mens work survive, their general features being that the motives are naturalistic, that the quality of the metal is exceptionally fine, that in addition to beautifully clear casting obtained by highly skilled use of the cera-perduta process, the chisel was employed to impart delicacy and finish to the design, and that modelling in high relief is most successfully introduced.

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  • Sometimes painting is introduced into these panels and lacquer and metal clasps are added to the ribs.

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  • In the beginning of the 19th century worked ShOkwasai, who frequently collaborated with the metal-worker Shibayama, encrusting his lacquer with small decorations in metal by the latter.

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  • In fine specimens the workmanship is extraordinarily minute, and every fragment of metal, shell, ivory or bone, used to construct the decorative scheme, is imbedded firmly in its place.

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  • The design is generally framed at the outset with a ribbon of thin metal, precisely after the manner of ordinary cloisonn ware.

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  • The artists great difficulty is to hide the metal base completely.

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  • A monochrome loses much of its attractiveness when the color merges into a metal rim, or when the interior of a vase is covered with crude unpolished paste.

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  • In other words, a suitable design is chiselled in the metal base so as to be visible through Translucid the diaphanous enamel.

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  • The principle usually followed in the electrolytic refining of metals is to cast the impure metal into plates, which are exposed as anodes in a suitable solvent, commonly a salt of the metal under treatment.

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  • The metal to be refined passing into solution is concurrently deposited at the cathode.

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  • Soluble impurities which are more electro-negative than the metal under treatment must, if present, be removed by a preliminary process, and the voltage and other conditions must be so selected that none of the more electro-positive metals are co-deposited with the metal to be refined.

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  • When an aqueous solution of the salt of an alkali metal is electrolysed, the Date.

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  • Many electrolytic methods have been proposed for the purification of sugar; in some of them soluble anodes are used for a few minutes in weak alkaline solutions, so that the caustic alkali from the cathode reaction may precipitate chemically the hydroxide of the anode metal dissolved in the liquid, the precipitate carrying with it mechanically some of the impurities present, and thus clarifying the solution.

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  • Yarnold's process, using corrugated glass plates coated on one side with gold or other metal leaf, is stated to have yielded as much as 2700 grains per e.h.p. hour.

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  • This and other reasons led to his rejection of the dualistic hypothesis and the adoption, on the ground of probability, and much more from convenience, of the tenet that " acids are particular compounds of hydrogen, in which the latter can be replaced by metals "; while, on the constitution of salts, he held that " neutral salts are those compounds of the same class in which the hydrogen is replaced by its equivalent in metal.

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  • It is apparent that metallic salts of organic acids would, in aqueous solution, be ionized, the positive ion being the metal, and the negative ion the acid residue.

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  • The oxalates are.readily decomposed onheating, leaving a residue of carbonate, or oxide of the metal.

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  • The silver salt decomposes with explosive violence, leaving a residue of the metal.

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  • It would seem, indeed, that any process by which the particles of two metals are intimately mingled and brought into close contact, so that diffusion of one metal into the other can take place, is likely to result in the formation of an alloy.

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  • The freezing surface, in this case, consists of three sheets each starting from an angular point of the surface, that is, from the freezing-point of a pure metal.

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  • The electrical conductivity of a metal is often very much decreased by alloying with it even small quantities of another metal.

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  • When a pure metal is cooled to a very low temperature its electrical conductivity is greatly increased, but this is not the case with an alloy.

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  • The addition of a third metal will sometimes render the mixture of two other metals homogeneous.

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  • Their experiments, although not conclusive, appear to indicate that the molecule of a metal when in dilute solution often consists of one atom.

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  • It can therefore be employed, instead of that costly metal, in the construction of incandescent lamps where a wire has to be fused into the glass to establish electric connexion between the inside and the outside of the bulb.

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  • If the electrified tray is touched with the sealing-wax or ebonite rod, it will not be discharged, but if touched with a metal wire, the hand, or a damp thread, it is discharged at once.

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  • Cavendish proved it by enclosing a metal sphere in two hemispheres of thin metal held on insulating supports.

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  • The thinnest possible spherical shell of metal, such as a sphere of insulator coated with gold-leaf, behaves as a conductor for static charge just as if it were a sphere of solid metal.

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  • From this fact it follows that we can shield any conductor entirely from external influence by other "charged conductors by enclosing it in a metal case.

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  • Electroscopes and electrometers, therefore, standing in proximity to electrified bodies can be perfectly shielded from influence by enclosing them in cylinders of metal gauze.

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  • On the plate of a gold-leaf electroscope place a metal canister having a loose lid.

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  • Let a metal ball be suspended by a silk thread, and the canister lid so fixed to the thread that when the lid is in place the ball hangs in the centre of the canister.

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  • I It is an interesting fact that Cavendish measured capacity in " globular inches," using as his unit the capacity of a metal ball, in.

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  • The metal slips are so placed that, as the disk revolves, the middle brush, connected to one terminal of the condenser C, is alternately put in conductive connexion with first one and then the other outside brush, which are joined respectively to the battery B and galvanometer G terminals.

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  • He constructed two equal condensers, each consisting of a metal ball enclosed in a hollow metal sphere, and he provided also certain hemispherical shells of shellac, sulphur, glass, resin, &c., which he could so place in one condenser between the ball and enclosing sphere that it formed a condenser with solid dielectric. He then determined the ratio of the capacities of the two condensers, one with air and the other with the solid dielectric. This gave the dielectric constant K of the material.

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  • The same reasoning can be applied to determine the electrical image of a point-charge of positive electricity in a spherical surface, and therefore the distribution of induced electricity over a metal sphere connected to earth produced by a point-charge near it.

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  • Then if U is the potential outside the surface due to this electric charge inside alone, and V that due to the opposite charge it induces on the inside of the metal surface, we must have U+V =O or U = - V at all points outside the earthed metal surface.

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  • Gold can be readily welded cold; the finely divided metal, in the state in which it is precipitated from solution, may be compressed between dies into disks or medals.

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  • It is insoluble in hydrochloric, nitric and sulphuric acids, but dissolves in aqua regia - a mixture of hydrochloric and nitric acids - and when very finely divided in a heated mixture of strong sulphuric acid and a little nitric acid; dilution with water, however, precipitates the metal as a violet or brown powder from this solution.

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  • The metal is soluble in solutions of chlorine, bromine, thiosulphates and cyanides; and also in solutions which generate chlorine, such as mixtures of hydrochloric acid with nitric acid, chromic acid, antimonious acid, peroxides and nitrates, and of nitric acid with a chloride.

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  • Skey showed that in substances which contain small quantities of gold the precious metal may be removed by the solvent action of iodine or bromine in water.

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  • These are the only certain examples of natural combinations of the metal, the minute, though economically valuable, quantity often found in pyrites and other sulphides being probably only present in mechanical suspension.

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  • The native metal crystallizes in the cubic system, the octahedron being the commonest form, but other and complex combinations have been observed.

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  • Owing to the softness of the metal, large crystals are rarely well defined, the points being commonly rounded.

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  • The physical properties of native gold are generally similar to that of the melted metal.

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  • Iron pyrites, however, is of greater practical importance, being in some districts exceedingly rich, and, next to the native metal, is the most prolific source of gold.

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  • The alloy with mercury-gold amalgam-is so readily formed that mercury is one of the most powerful agents for extracting the precious metal.

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  • The Japanese use for ornament an alloy of gold and silver, the standard of which varies from 350 to 500, the colour of the precious metal being developed by " pickling " in a mixture of plum-juice, vinegar and copper sulphate.

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  • Gold and Zinc.-When present in small quantities zinc renders gold TABLE II.-Gold brittle, but it may be added to gold in larger quantities without destroying the ductility of the precious metal; Peligot proved that a triple alloy of gold, copper and zinc, which contains 5.8% of the lastnamed, is perfectly ductile.

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  • Auric chloride, or gold trichloride, AuC1 3, is a dark rubyred or reddish-brown, crystalline, deliquescent powder obtained by dissolving the metal in aqua regia.

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  • It is also obtained by carefully evaporating a solution of the metal in chlorine water.

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  • In the placer or alluvial deposits, the precious metal is found usually in a water-worn condition imbedded in earthy matter, and the method of working all such deposits is based on the disintegration of the earthy matter by the action of a stream of water, which washes away the lighter portions and leaves the denser gold.

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  • It was at one time proposed to treat the concentrated black iron obtained in the Ural gold washings, which consists chiefly of magnetite, as an iron ore, by smelting it with charcoal for auriferous pigiron, the latter metal possessing the property of dissolving gold in considerable quantity.

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  • This is smelted with rich gold ores, notably those containing tellurium, for white metal or regulus; and by a following process of partial reduction analogous to that of selecting in copper smelting, " bottoms " of impure copper are obtained in which practically all the gold is concentrated.

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  • By continuing the treatment of these in the ordinary way of refining, poling and granulating, all the foreign matters other than gold, copper and silver are removed, and, by exposing the granulated metal to a high oxidizing heat for a considerable time the copper may be completely oxidized while the precious metals are unaltered.

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  • Faraday applied it to the preparation of extremely thin films of the metal.

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  • The operation may be conducted in vessels of glass or platinum, and each pound of granulated metal is treated with a pound and a quarter of nitric acid of specific gravity 1.32.

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  • Or Gutzkow's method of precipitating the metal with ferrous sulphate may be employed.

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  • Under good conditions the gold should contain 99.98% of the pure metal.

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  • A high current-density being employed, the turn-over of gold is rapid - an essential factor of success when the costliness of the metal is taken into account.

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  • It is essential that the bath should not contain more than 5% of palladium, or some of this metal will deposit with the gold.

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  • Swords, iron spears and arrow-heads, and a few copper caldrons, fabricated from the metal obtained in the country, complete the list of manufactures.

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  • The contemporaneity of these structures has been demonstrated by the identity of the pottery and other objects discovered in them, including some remarkable steatopygic figures in stone, and it is clear that they belong to the neolithic period, numerous flints, but no metal, having been found.

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  • Geoffroy, son of Claude Joseph Geoffroy, whose contribution to our knowledge of this metal appeared in the Memoires de l'academie francaise for 1753.

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  • Torbern Olof Bergman reinvestigated its properties and determined its reactions; his account, which was published in his Opuscula, contains the first fairly accurate description of the metal.

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  • The principal source of bismuth is the native metal, which is occasionally met with as a mineral, usually in reticulated and arborescent shapes or as foliated and granular masses with a crystalline fracture.

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  • The dry process is more frequently practised, for the easy reducibility of the oxide and sulphide, together with the low melting-point of the metal, renders it possible to effect a ready separation of the metal from the gangue and impurities.

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  • In the liquation process the ore is heated in inclined cylindrical retorts, and the molten metal is tapped at the lower end; the residues being removed from the upper end.

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  • A certain amount of bismuth sulphate is always formed during the calcination; this is subsequently reduced to the sulphide and ultimately to the metal in the fusion.

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  • Another process consists in adding water to the solution and so precipitating the bismuth as oxychloride, which is then converted into the metal.

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  • The crude metal obtained by the preceding processes is generally contaminated by arsenic, sulphur, iron, nickel, cobalt and antimony, and sometimes with silver or gold.

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  • A better process is to remelt the metal in crucibles with the addition of certain refining agents.

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  • The details of this process vary very considerably, being conditioned by the composition of the impure metal and the practice of particular works.

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  • The wet refining process is more tedious and expensive, and is only exceptionally employed, as in the case of preparing the pure metal or its salts for pharmaceutical or chemical purposes.

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  • The basic nitrate is the salt generally prepared, and, in general outline, the process consists in dissolving the metal in nitric acid, adding water to the solution, boiling the precipitated basic nitrate with an alkali to remove the arsenic and lead, dissolving the residue in nitric acid, and reprecipitating as basic nitrate with water.

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  • Hampe prepared chemically pure bismuth by fusing the metal with sodium carbonate and sulphur, dissolving the bismuth sulphide so formed in nitric acid, precipitating the bismuth as the basic nitrate, redissolving this salt in nitric acid, and then precipitating with ammonia.

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  • Bismuth is a very brittle metal with a white crystalline fracture and a characteristic reddish-white colour.

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  • It therefore expands on solidification; and as it retains this property in a number of alloys, the metal receives extensive application in forming type-metals.

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  • The metal oxidizes very slowly in dry air at ordinary temperatures, but somewhat more rapidly in moist air or when heated.

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  • It is precipitated as the metal from solutions of its salts by the metals of the alkalis and alkaline earths, zinc, iron, copper, &c. In its chemical affinities it resembles arsenic and antimony; an important distinction is that it forms no hydrogen compound analogous to arsine and stibine.

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  • This compound occurs in nature as bismuth ochre, and may be prepared artificially by oxidizing the metal at a red heat, or by heating the carbonate, nitrate or hydrate.

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  • Bismuth dioxide, BiO or Bi 2 O 2, is said to be formed by the limited oxidation of the metal, and as a brown precipitate by adding mixed solutions of bismuth and stannous chlorides to a solution of caustic potash.

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  • Bismuth trichloride, BiC13, was obtained by Robert Boyle by heating the metal with corrosive sublimate.

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  • The normal nitrate, Bi(N03)3.5H20, is obtained in large transparent asymmetric prisms by evaporating a solution of the metal in nitric acid.

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  • Bismuth sulphate, B12(S04)3, is obtained as a white powder by dissolving the metal or sulphide in concentrated sulphuric acid.

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  • The metal can be reduced by magnesium, zinc, cadmium, iron, tin, copper and substances like hypophosphorous acid from acid solutions or from alkaline ones by formaldehyde.

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  • Many amalgams are formed by the direct contact of a metal with mercury, sometimes with absorption, sometimes with evolution, of heat.

    0
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  • Other methods are to place the metal and mercury together in dilute acid, to add mercury to the solution of a metallic salt, to place a metal in a solution of mercuric nitrate, or to electrolyse a metallic salt using mercury as the negative electrode.

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  • Moulds for reproducing plates or art-work are often taken in plaster, beeswax mixed with Venice turpentine, fusible metal, or guttapercha, and the surface being rendered conductive by powdered black-lead, copper is deposited upon it evenly throughout.

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  • Struve also points out that by attaching a fine scale to the focusing slide of the eye-piece, and knowing the coefficient of expansion of the metal tube, the means would be provided for determining the absolute change of the focal length of the object-glass at any time by the simple process of focusing on a double star.

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  • Berzelius, who prepared tantalic acid from the mineral tantalite in 1820, obtained an impure metal by heating potassium tantalofluoride with potassium.

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  • Moissan obtained a carbon-bearing metal by fusing the pentoxide with carbon in the electric furnace.

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  • The preparation of the pure metal was successfully effected by Werner von Bolton in 1905, who fused the compressed product obtained in the Berzelius process in the electric furnace, air being excluded.

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  • The metal is manufactured, for use as filaments in electric lamps, by the action of sodium on sodium tantalofluoride.

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  • The pure metal is silver-white in colour, is very ductile, and becomes remarkably hard when hammered, a diamond drill making little impression upon it.

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  • When heated in air the metal burns if in the form of thin wire, and is superficially oxidized if more compact.

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  • These substances, and also carbon, sulphur, selenium and tellurium, render the metal very brittle.

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  • Its double salts with the alkaline fluorides are very important, and serve for the separation of the metal from columbium and titanium.

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  • Sahlbom (Ber., 1906, 39, p. 2600) obtained 179.8 (H =1) by converting the metal into pentoxide at a dull red heat.

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  • Buchanan, which has an arbitrary scale and can be varied in weight by placing small metal rings on the stem so as to depress the scale to any desired depth in sea-water of any salinity, the specific gravity being calculated for each reading by dividing the total weight by the immersed volume; (3) the total immersion areometer, which has no scale and the weight of which can be adjusted so that the instrument can be brought so exactly to the specific gravity of the water sample that it remains immersed, neither floating nor sinking; this has the advantage of 'eliminating the effects of surface tension and in Fridtjof Nansen's pattern is capable of great precision.

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  • It is a silvery white metal which burns on heating in air.

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  • In decoration, the acanthus was first reproduced in metal, and subsequently carved in stone by the Greeks.

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  • The crucible is of metal and considerably larger than the ingot, the latter being surrounded by a mass of unreduced material which protects the crucible from the intense heat.

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  • The study of electricity he took up in 1746 when he first saw a Leyden jar, in the manipulation of which he became expert and which he improved by the use of granulated lead in the place of water for the interior armatures; he recognized that condensation is due to the dielectric and not to the metal coatings.

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  • The industries of Arnstadt include iron and other metal founding, the manufacture of leather, cloth, tobacco, weighing-machines, paper, playing-cards, chairs, gloves, shoes, iron safes, and beer, and market-gardening and trade in grain and wood are carried on.

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  • That they retained the laying on of hands in their spiritual baptism was an inconsistency which their orthodox opponents did not fail to note; the human hand, argued the latter, is, like the rest of the body, no less the work of the evil creator than water, oil, bread and wine, or than the wood, metal and stone out of which altars, images and churches are made.

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  • The metal may be obtained by reduction of its oxide with magnesium.

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  • This weapon embodied all the essential features which distinguish the ordnance of to-day from the cannon of the middle ages - it was built up of rings of metal shrunk upon an inner steel barrel; it was loaded at the breech; it was rifled; and it threw, not a round ball, but an elongated projectile with ogival head.

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  • Among other manufactures are brushes, boilers and the like, machinery, metal ware generally, the cases and other parts of watches.

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  • Stone-cutters' tools of metal are not known to have existed, and they were not needed.

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  • No evidence of smelting ores with fluxes is offered, but casting from metal melted in open fires is assumed.

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  • There were just as good materials and inspirations, but what could the best of them do without metal tools?

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  • Until the 9th century the only means for sighting cannon was by the " line of metal " - a line scored_ along the top of the gun, which, owing to the greater thickness of metal at the breech than at the muzzle, was not parallel to the axis.

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  • The line of metal does not come under the definition of sights given above.

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  • Owing to the conical shape of the early muzzle-loading guns, if one trunnion were higher than the other, the " line of metal " would no longer be in the same vertical plane as the axis; in consequence of this, if a gun with, say, one wheel higher than the other were layed by this line, the axis would point off the target to the side of the lower wheel.

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  • As the tangent sight was placed in the line of metal, hence directly over the cascable, very little movement could be given to it, so that a second sight was required for long ranges.

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  • It has also an orthodox bishop. The Roman Catholics, who constitute the majority of citizens, possess a lofty and beautiful cruciform cathedral, built entirely of stone and metal.

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  • The town has a large garrison, consisting of nearly all arms. Its industries are considerable, including the manufacture of machinery, metal ware, chemicals, paper, leather and sugar.

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  • The tetroxide, 0s04, can be easily reduced to the metal by dissolving it in hydrochloric acid and adding zinc, mercury, or an alkaline formate to the liquid, or by passing its vapour, mixed with carbon dioxide and monoxide, through a red-hot porcelain tube.

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  • The metal has a blue-grey colour, and may be obtained in the crystalline state by solution in tin.

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  • Osmium dichloride, OsC1 21 is obtained as a dark coloured powder when the metal is heated in a current of chlorine.

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  • The image of the Lar, made of wood, stone or metal, sometimes even of silver, stood in its special shrine (lararium), which in early times was in the atrium, but was afterwards transferred to other parts.

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  • The metal was obtained by Berzelius as an iron-grey powder by heating potassium zirconofluoride with metallic potassium.

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  • The powdery metal burns readily in air; the crystalline metal requires to be heated in an oxyhydrogen flame before it catches fire.

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  • Mineral acids generally attack the crystallized metal very little even in the heat; aqua regia, however, dissolves it readily, and so does hydrofluoric acid.

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  • The church of the Magdalene possesses two candelabra, a gold cross, and various other works in metal by Bishop Bernward; and the Lutheran church of St Andrew has a choir dating from 1389 and a tower 385 ft.

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  • It is an important centre of trade with Rajputana, and has factories for ginning and pressing cotton, and metal manufactures.

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  • Coins are pieces of metal, of weight and composition fixed by law, with a design upon them, also fixed by law, by which they are identified, their value made known and their genuineness certified.

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  • The earliest metallic money did not consist of coins, but of unminted metal in the form of rings and other ornaments or of weapons, which were used for thousands of years by the Egyptian, Chaldean and Assyrian Empires.

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  • The Romans cast their larger copper coins, in clay moulds carrying distinctive markings, not because they knew nothing of striking, but because it was not suitable for such large masses of metal.

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  • The " blank " or unmarked piece of metal was placed on a small anvil (ambos), and the die was held in position with tongs.

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  • Square pieces of metal were also cut from cast bars, converted into round disks by hammering and then struck between dies.

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  • In striking, the lower die was fixed into a block of wood, and the blank piece of metal laid upon it by hand.

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  • Olivier introduced screw presses for striking coins, together with rolls for reducing the cast bars and machines for punching-out round disks from flattened sheets of metal, in Paris in 1553.

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  • In foreign mints the molten metal is generally transferred from the crucible to the moulds by dipping crucibles or iron ladles covered with clay.

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  • The losses are caused by volatilization, by the absorption of metal by the crucible, stirring rod, &c., and by occasional projection of particles from the pot into the furnace.

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  • The ash-pit is lined with iron plates to facilitate the recovery of metal accidentally spilt.

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  • All crucibles and other materials which might contain precious metal are ground up and washed in a pan, and the pannings together with a selection from the floor sweepings are remelted.

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  • The result is that so long as the fillets are hot they are kept from contact with the air and blackening of the metal is prevented.

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  • When the fillet FF is brought above the holes, the cutters descend and force disks of metal through the holes.

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  • The scissel, which amounts to about 30% of the metal operated on, is returned in bundles to the melting house.

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  • The removal of part of the copper from the blank raises the percentage of silver contained in them and this is allowed for by adding an equivalent amount of copper to the metal when it is melted.

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  • The process will probably be abandoned as soon as the tarnishing of the metal during rolling and annealing can be avoided.

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  • The pressure causes the soft metal to flow like a viscous solid, but its lateral escape is prevented by a collar which surrounds the blank while it is being struck.

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  • This is done by the little crank B on the axle of the fly-wheel, acting through the rod C, and the bent lever D, which forms a toggle-joint at E with the vertical piece of metal below it.

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  • Some metal from the surface of each blank then passes into solution, and the blanks are reduced in weight with remarkable uniformity.

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  • Among its other industries are cotton printing and dye works, brewing, and the making of metal and bronze goods.

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  • The total value of the gold exported from New Zealand from the discovery of the metal in 1857 to 1907 was, roundly, £70,000,000.

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  • A small metal disk was attached to the centre of the membrane and connected to earth by a fine wire.

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  • A metal contact-piece adjustable by a screw could be made to just touch a point at the centre of the disk.

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  • A metal or brass tube will serve as such a pipe, and may be excited by a suitable tuning-fork held at one end.

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  • A glass or metal rod, the " sounder," is clamped at its middle point, and fixed along the prolongation of the axis of the dust-tube as in fig.

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  • As usually arranged, a thin metal plate is screwed on to the top of a firm upright post at the centre of the plate, which is horizontal.

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  • It contains the largest copper producing district in the world, and in 1907 mined more copper than any other state or territory except Arizona; this metal constituted nearly three-fourths in value of the state's mining products in 1907, the total value being $60,663,511 and that of copper $44, 8 5 2, 75 8.

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  • The total value of metal raised in Saxony in 1907 was £7,036,000; in 1870 it was £314,916.

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  • The smelting and refining of the metal ores is also an important industry.

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  • There is no indication of an abrupt change from the use of stone to the use of metal such as might have occurred had the knowledge of copper and bronze, and the methods of working them, been introduced through the conquest of the original inhabitants by an alien race of superior culture and civilization.

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  • It is only since metal has been used that the great spans of Soo to 1800 ft.

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  • Masonry and concrete are more durable than metal, and metal than timber.

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  • Masonry bridges are preferable in appearance to any others, and metal arch bridges are less objectionable than most forms of girder.

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  • For an elastic arch of metal there is a more complete theory, but it is difficult of application, and there remains some uncertainty unless (as is now commonly done) hinges are introduced at the crown and springings.

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  • The suspension bridge dispenses with the compression member required in girders and with a good deal of the stiffening required in metal arches.

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  • In the modern metal bridge every member has a definite function and is subjected to a calculated straining action.

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  • Such hinges have been used not only for metal arches, but in a modified form for masonry and concrete arches.

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  • Occasionally metal work or woodwork is used for intermediate piers.

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  • In metal bridges wrought iron has been replaced by mild steel - a stronger, tougher and better material.

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  • Ingot metal or mild steel was sometimes treacherous when first introduced, and accidents occurred, the causes of which were obscure.

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  • The Edison electric meter, like those of Sprague and Lane-Fox, was based upon the principle that when an electric current flows through an electrolyte, such as sulphate of copper or sulphate of zinc, the electrodes being plates of copper or zinc, metal is dissolved off one plate (the anode) and deposited on the other plate (the cathode).

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  • The Turkish fleet, "adrift in the Archipelago" - as the British seamen put it - though greatly superior in tonnage and weight of metal, could never be a match for the Greek brigs, manned as these were by trained, if not disciplined, crews.

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  • The level of the land is so low, the soil so soft, and stone suitable for metal so entirely absent, that the making and upkeep of roads would here be ruinously expensive.

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  • His attempts at isolating this metal were not completely successful; in fact, metallic calcium remained a laboratory curiosity until the beginning of the 10th century.

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  • Henri Moissan obtained the metal of 99% purity by electrolysing calcium iodide at a low red heat, using a nickel cathode and a graphite anode; he also showed that a more convenient process consisted in heating the iodide with an excess of sodium, forming an amalgam of the product, and removing the sodium by means of absolute alcohol (which has but little action on calcium), and the mercury by distillation.

    0
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  • The electrolytic isolation of calcium has been carefully investigated, and this is the method followed for the commercial production of the metal.

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  • Ruthenau and C. Suter have made the metal commercially available.

    0
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  • A freshly prepared surface of the metal closely resembles zinc in appearance, but on exposure to the air it rapidly tarnishes, becoming yellowish and ultimately grey or white in colour owing to the formation of a surface layer of calcium hydrate.

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  • It is rapidly acted on by water, especially if means are taken to remove the layer of calcium hydrate formed on the metal; alcohol acts very slowly.

    0
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  • The metal as prepared by electrolysis generally contains traces of aluminium and silica.

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  • The corollary, that the electric resistance of a metal can be determined in absolute units by experiments on the reflexion of heat-rays from its surface, is a striking illustration of the unification of the various branches of physical science, which has come in the train of the development of the theory of the aether.

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  • Wages have also been the subject of legislation; special commissions have been empowered to regulate the wages in the so-called " home " industries (sweating), and an arbitration board has been appointed to fix the salaries of clerks in the metal industry, thus minimizing the danger of conflicts in respect of wages having to be settled by means of strikes.

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  • The surface is formed of cement moulded over metal gimmel-work, and arranged to form ledges and boulders, peaks and escarpments, and faced with coloured sand and paint.

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  • The art museum, in Eden Park, contains paintings by celebrated European and American artists, statuary, engravings, etchings, metal work, wood carving, textile fabrics, pottery, and an excellent collection in American ethnology and archaeology.

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  • Deville made many improvements, but the method remained wasteful and uneconomical, and in 1872 the metal cost 4s.

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  • During electrolysis, oxygen is evolved at the anode and escapes from the outer vessel, while the sodium deposited in globules on the cathode floats upwards into the iron cylinder, within which it accumulates, and from which it may be removed at intervals by means of a perforated iron ladle, the fused salt, but not the metal, being able to pass freely through the perforations.

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  • At ordinary temperatures the metal has the consistency of wax and can be readily cut; on cooling it hardens.

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  • Matthiessen, sodium ranks fourth to silver, copper and gold as a conductor of electricity and heat, and according to Bunsen it is the most electropositive metal with the exception of caesium, rubidium and potassium.

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  • A fragment thrown on the surface of water rapidly disengages hydrogen, which gas, however, does not inflame, as happens with potassium; but inflammation occurs if hot water be used, or if the metal be dropped on moist filter paper.

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  • In practice the metal is placed on aluminium trays traversing an iron tube heated to 300 0, through which a current of air, freed from moisture and carbon dioxide, is passed; the process is made continuous, and the product contains about 93% Na202.

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  • His speculum metal is composed of four atoms of copper (126.4 parts) and one of tin (58.9 parts), a brilliant alloy, which resists tarnish better than any other compound tried.

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  • Sugar, coffee, machinery, metal work of all kinds, clothing and pottery are largely imported.

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  • In practical work, the low resistances take the form of certain strips of metal which have on them two pairs of terminals, one termed " current terminals," and the other " potential terminals."

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  • Although never found free in nature, in combination the metal is abundantly and widely distributed.

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  • Brunner's process consisted in forming an intimate mixture of potassium carbonate and carbon by igniting crude tartar in covered iron crucibles, cooling the mass, and then distilling it at a white heat from iron bottles, the vaporized metal being condensed beneath the surface of paraffin or naphtha contained in a copper vessel.

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  • It was found, however, that if the cooling be not sufficiently rapid explosions occurred owing to the combination of the metal with carbon monoxide (produced in the oxidation of the charcoal) to form the potassium salt of hexaoxybenzene.

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  • The metal, however, is not in great demand, for it is generally found that sodium, which is cheaper, and, weight for weight, more reactive, will fulfil any purpose for which potassium may be desired.

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  • Pure potassium is a silvery white metal tinged with blue; but on exposure to air it at once forms a film of oxide, and on prolonged exposure deliquesces into a solution of hydrate and carbonate.

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  • Its specific gravity is o 865; hence it is the lightest metal known except lithium.

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  • It may be obtained crystallized in quadratic octahedra of a greenish-blue colour, by melting in a sealed tube containing an inert gas, and inverting the tube when the metal has partially solidified.

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  • A pellet of potassium when thrown on water at once bursts out into a violet flame and the burning metal fizzes about on the surface, its extremely high temperature precluding absolute contact with the liquid, exce p t at the very end, when the last remnant, through loss of temperature, is wetted by the water and bursts with explosive violence.

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  • When the oxide-free metal is heated gently in dry ammonia it is gradually transformed into a blue liquid, which on cooling freezes into a yellowish-brown or flesh-coloured solid, potassamide, KNH 2.

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  • The peroxide, K204, discovered by Gay-Lussac and Thenard, is obtained by heating the metal in an excess of slightly moist air or oxygen.

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  • The hydrosulphide, KHS, was obtained by Gay-Lussac on heating the metal in sulphuretted hydrogen, and by Berzelius on acting with sulphuretted hydrogen on potassium carbonate at a dull red heat.

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  • Potassamide, NH 2 K, discovered by Gay-Lussac and Thenard in 1871, is obtained as an olive green or brown mass by gently heating the metal in ammonia gas, or as a white, waxy, crystalline mass when the metal is heated in a silver boat.

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  • For this purpose the thermit is placed in a can on the end of a rod and plunged to the bottom of the molten metal.

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  • The name beryllium was given to the metal by German chemists and was generally used until recently, when the earlier name was adopted.

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  • Being an intelligent man, he perceived the commercial value of his chance discovery, and began the manufacture of articles which, with all the appearance of silver, were both cheaper and stronger than those made of the pure metal.

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  • The groundwork was a mixture of copper and brass, either metal alone having serious defects.

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  • At first only one surface of the copper was plated with silver and thus its usefulness was necessarily restricted, but it was a simple matter to apply the silver to both sides and thenceforward whatever was made in solid metal could be reproduced in plate, and firm after firm went into the business, ever and anon introducing further improvements.

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  • The possibility of embossing the metal beyond a certain point without fracturing the coating of silver was got over by casting or stamping the raised ornament in silver, filling the hollows with.

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  • The labour of rolling the metal by hand was done away with about 1760, by the firm of Tudor, Leader & Sherburn, who first employed horse-power, and for more than half a century the trade both in Sheffield and Birmingham continued to flourish.

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  • For ordinary standards of length Guillaume's alloy (invar) of nickel (35.7%) and steel (64.3%) is used, as it is a metal that can be highly polished, and is capable of receiving fine graduations.

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  • It has an Evangelical and a Roman Catholic church, manufactories of gloves, patent leather, paper, metal ware and artificial manures, and a considerable trade in cereals.

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  • Large masses of the metal are also said to exist in the sierras of Lower California.

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  • The criminal laws were of extreme severity, even petty theft being punished by the thief being enslaved to the person he had robbed, while to steal a tobacco pouch or twenty ears of corn was death; he who pilfered in the market was then and there beaten to death, and he who insulted Xipe, the god of the goldand silversmiths, by stealing his precious metal, was skinned alive and sacrificed to the offended deity.

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  • The mineral nearly always contains a small amount of silver, and sometimes antimony, arsenic, copper, gold, selenium, &c. Argentiferous galena is an important source of silver; this metal is present in amounts rarely exceeding %, and often less than o 03% (equivalent to 104 ounces per ton).

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  • The presence of a bed of lignite in the neighbourhood has encouraged the industrial development of Teplitz, which carries on manufactures of machinery and metal goods, cotton and woollen goods, chemicals, hardware, sugar, dyeing and calicoprinting.

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  • The brass and bronze industries are carried on at Iserlohn and Altena, those of tin and Britannia metal at Ludenscheid; needles are made at Iserlohn and wire at Altena.

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  • As many as 119 lead mines were worked in the parish in 1768, but the supply of metal has been almost exhausted.

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  • The iodides can be prepared either by direct union of iodine with a metal, from hydriodic acid and a metal, oxide, hydroxide or carbonate, or by action of iodine on some metallic hydroxides or carbonates (such as those of potassium, sodium, barium, &c.; other products, however, are formed at the same time).

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  • They are decomposed on heating, with liberation of oxygen, in some cases leaving a residue of iodide and in others a residue of oxide of the metal, with liberation of iodine as well as of oxygen.

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  • The essential part of the medicinal treatment of this condition is the administration of iodides, which are able to decompose the insoluble albuminates of lead which have become locked up in the tissues, rapidly causing their degeneration, and to cause the excretion of the poisonous metal by means of the intestine and the kidneys.

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  • For such purposes the whole of the working parts are contained in a metal case; the indicating needle moving over a divided scale which is calibrated to show directly the potential difference in volts of the terminals of the instrument.

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  • In the engineering industries milling machines constitute a very important class of machine tools, the characteristic of which is that rotary cutters are employed for shaping the metal.

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  • The double cyanides formed by the solution of the cyanide of a heavy metal in a solution of potassium cyanide are decomposed by mineral acids with liberation of hydrocyanic acid and formation of the cyanide of the heavy metal.

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  • Besides these, other double cyanides are known which do not suffer such decomposition, the heavy metal present being combined with the cyanogen radical in the form of a complexion.

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  • Henry Draper's most important contributions to science were made in spectroscopy; he ruled metal gratings in 1869-1870, made valuable spectrum photographs after 1871, and proved the presence of oxygen in the sun in a monograph of 1877.

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  • The silver and mercury salts, when heated, yield the metal, with liberation of carbon dioxide and formation of free formic acid; and the ammonium salt, when distilled, gives some formamide, Hconh 2.

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