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 %.
[Lord Kelvin's formula (I) may be applied to find the surf acetension of a clean or contaminated liquid from observations upon the length of waves of known periodic time, travelling over the surface.
All the cities along the Mississippi River had been marked as contaminated to some extent.
2, 3) likes water contaminated by the visits of cattle or the drainings of manure.
28 became "contaminated " by the legend of St Joseph of Arimathaea and the Holy Grail, and took the form given in Roger of Wendover and Matthew Paris.
When amongst the litter of a properly mated, highly bred fox-terrier, pups are found with long bodies and thick short legs and feet, breeders are disposed to excuse the result by the supposition that the bitch has been contaminated by some earlier mating.
Since all sulphuretted copper ores (and these are of the most economic importance) are invariably contaminated with arsenic and antimony, it is necessary to eliminate these impurities, as far as possible, at a very early stage.
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.
Pure lead is far more readily corroded than a metal contaminated with 1% or even less of antimony or copper.
Owing to the fact that at temperatures between its melting and boiling point zinc has a strong affinity for iron, it is often contaminated by the scraper while being drawn from the condenser, as is shown by the fact that the scraper wears away rapidly.
On the ground that all the earlier copies had been contaminated by the Latin - almost reversing the teaching of Bentley.
Both the air and the water in their neighbourhood were contaminated thereby.
Conditions of a contaminated surface may easily be distinguished, upon all of which camphor fragments spin vigorously.
The rubber is usually dark in colour and is often contaminated with proteid impurities derived from the latex.
- Lead contaminated with small proportions of antimony is more highly proof against sulphuric acid than the pure metal.
Such clothing is not necessarily infectious; indeed, the probability is that it is not, unless contaminated by discharges.
Is the best representative of H, but it has been contaminated by the Egyptian versions, and sometimes by the K and I texts and by Origen, though not to any great extent.
The older methods used for the preparation of the amorphous form, namely the decomposition of silicon halides or silicofluorides by the alkali metals, or of silica by magnesium, do not give good results, since' the silicon obtained is always contaminated with various impurities, but a pure variety may be prepared according to E.
If, according to the present method of winning the metal, a bath containing silica as well as alumina is submitted to electrolysis, both oxides are dissociated, and as silicon is a very undesirable impurity, an alumina contaminated with silica is not suited for reduction.
Such pyrites sulphur is usually contaminated with arsenic, and conse- quently is of less value than Sicilian sulphur, which is characteristically free from this impurity.
If a drop of oil stands in lenticular form upon a surface of water, it is because the water-surface is already contaminated with a greasy film.
As quarried or mined free sulphur is always contaminated with limestone, gypsum, clay, &c.; the principle underlying its extraction from these impurities is one of simple liquation, i.e.
Ficino differed from the majority of his contemporaries in this that, while he felt the influence of antiquity no less strongly than they did, he never lost his faith in Christianity, or contaminated his morals by contact with paganism.
The unhealthiness of the city is chiefly due to want of proper drainage, impure drinkingwater, miasma from the disturbed rubbish heaps, and contaminated dust from the uncleansed roads and streets.
Thus malaria and sand-fly fever, dysentery, typhoid and paratyphoid fever, cholera, smallpox, and occasionally typhus fever, eye diseases, oriental sores and indeed any disease conveyed by impure water, flies, contaminated dust or the contagion of sufferers from infectious diseases, are prevalent in the inhabited places along the Persian Gulf, and precautions must always be taken to guard against them.
So far from attempting to raise their standard of spiritual life, or even leaving it to ordinary intercourse to gradually bring about a certain community of intellectual culture and religious sentiment, they deliberately set up artificial barriers in order to prevent their own traditional modes of worship from being contaminated with the obnoxious practices of the servile race.
Commercial red lead is frequently contaminated with this oxide, which may, however, be removed by repeated digestion with lead acetate.
Second in importance is the carbonate, calamine (q.v.) or zinc spar, which at one time was the principal ore; it almost invariably contains the carbonates of cadmium, iron, manganese, magnesium and calcium, and may be contaminated with clay, oxides of iron, galena and calcite; "white calamine" owes its colour to much clay; "red calamine" to admixed iron and manganese oxides.
Titanic oxide separates out as a white hydrate, which, however, is generally contaminated with ferric hydrate and often with tin oxide.
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.
The air was continually returned and circulated until it was too much contaminated with carbonic acid to be further used, a condition which limited the use of the apparatus to a very short period.
This second method of production has the great drawback that, unless proper precautions are taken to purify the gas obtained from the copper acetylide, it is always contaminated with certain chlorine derivatives of acetylene.
The soil of yards and the floors and walls of houses rapidly become contaminated, and the ideal condition would be to have an impermeable flooring covering the whole area, and supplied with suitable layers of sand, sawdust, peat-moss or other absorbent substances which can be changed at frequent intervals.
All commercial caustic potash is contaminated with excess of water (over and above that in the KHO) and with potassium carbonate and chloride; sulphate, as a rule, is absent.
Contaminated as it was with potassium and with platinum from the crucible, the metal formed a grey powder and was far from pure; but in 1845 he improved his process and succeeded in producing metallic globules wherewith he examined its chief properties, and prepared several compounds hitherto unknown.
These people live under the poorest conditions, by doing smith's work; they speak among themselves a Romani dialect, much contaminated with Arabic in its vocabulary.
The process described by Quincke is somewhat elaborate; but there is little difficulty in repeating the experiment if the mistake be avoided of using a free surface already contaminated, as almost inevitably happens when the mercury is poured from an ordinary bottle.
Milk is a medium not only admirably suited to the growth of bacteria, but ry Y Y g as a matter of fact, always contaminated with these organisms in the ordinary course of supply.
The ordinary commercial arsenic is either the naturally occurring form, which is, however, more or less contaminated with other metals, or is the product obtained by heating arsenical pyrites, out of contact with air, in earthenware retorts which are fitted with a roll of sheet iron at the mouth, and an earthenware receiver.
In 1900 an outbreak of "peripheral neuritis" with various skin affections occurred in Lancashire, which was traced to beer made from glucose and invert sugar, in the preparation of which sulphuric acid contaminated with arsenic was said to have been used.
It has been shown abundantly, however, that even the best designed and best cared for buildings rapidly become contaminated, and it is probable that the costly and massive buildings of the more modern Gardens are erroneous in principle, and should be replaced by light and cheap structures not intended to last longer than a few years.