He constructed one form of his coherer of a glass tube a few inches long filled with iron borings or brass filings, having contact plates or pins at the end.
As the small filings produced by friction seek to pass through the interstices between the rapidly revolving spherical particles in the vortex, they are detained and become twisted and channelled in their passage, and when they reach the edge of the inner ocean of solar dust they settle upon it as the froth and foam produced by the agitation of water gathers upon its surface.
The Chateau of the duc de Luynes, the translator of the Meditations, was the home of a Cartesian club, that discussed the questions of automatism and of the composition of the sun from filings and parings, and rivalled Port Royal in its vivisections.
He discovered a fact subsequently rediscovered by others, that a tube of metallic filings, loosely packed, was sensitive to electric sparks made in its vicinity, its electrical resistance being reduced, and he was able to detect effects on such a tube connected to a battery and telephone at a distance of 500 yds.'
When such a tube is inserted in series with a single voltaic cell and galvanometer it is found that the resistance of the tube is nearly infinite, provided the filings are not too tightly squeezed.
In 1894 he exhibited apparatus of this kind in which the tapping back of the tube of filings was effected automatically.
At the receiving station Marconi connected a single voltaic cell B 1 and a sensitive telegraphic relay R in series with his tube of metallic filings C, and interposed certain little coils called choking coils.
- Marconi Sensitive Metallic Filings Tube or Electric Wave Detector.
Lodge arranged a mechanical tapper for the purpose which continually administered the small blow to the tube sufficient to keep the filings in a sensitive condition.
This hammer is arranged so that when the armature vibrates it gives little blows to the underside of the tube and shakes up the filings.
Fleming 5 invented special forms of the metallic contact or metallic filings sensitive tube.
The secondary circuit of this transformer is cut in the middle and has a condenser inserted in it, and its ends are connected to the sensitive metallic filings tube or coherer as shown in fig.
If a magnet is dipped into a mass of iron filings and withdrawn, filings cling to certain parts of the stone in moss-like tufts, other parts remaining bare.
Some of the principal phenomena of magnetism may be demonstrated with very little apparatus; much may be done with a small bar-magnet, a pocket compass and a few ounces of iron filings.
A sheet of cardboard is placed above the magnet, and some iron filings are sifted thinly and evenly over the surface: if the cardboard is gently tapped, the filings will arrange themselves in a series of curves, as shown in fig.
ir`"' lines of force," of which the curves formed by the filings afford a rough indication; Faraday's lines are howeve confined to the plane of the cardboard, but occur in the whole of the space around the magnet.
A south pole would be urged oppositely to the conventional " direction " of the line; hence it follows that a very small magnetic needle, if placed in the field, would tend to set itself along or tangentially to the line of force passing through its centre, as may be approximately verified if the compass be placed among the filings on the cardboard.
If the operation has been skilfully performed the ring will have no poles and will not attract iron filings.
Stannic Chloride, SnC1 4, named by Andreas Libavius in 1605 Spiritus argenti vivi sublimate from its preparation by distilling tin or its amalgam with corrosive sublimate, and afterwards termed Spiritus fumans Libavii, is obtained by passing dry chlorine over granulated tin contained in a retort; the tetrachloride distils over as a heavy liquid, from which the excess of chlorine is easily removed by shaking with a small quantity of tin filings and re-distilling.
Alloys of magnesium and silicon are prepared by heating fragments of magnesium with magnesium filings and potassium silico-fluoride.
For efficiency the operation must be conducted with small quantities; caking may be prevented by mixing the substance with sand or powdered pumice, or, better, with iron filings, which also renders the decomposition more regular by increasing the conductivity of the mass.
Chlorates); but it is manufactured by acting with bromine water on iron filings and decomposing the iron bromide thus formed with potassium carbonate.
By heating magnesium filings with methyl and ethyl iodides A.
Winkler discovered that an iron chain wound round the bottle could be substituted for the hand, and Sir William Watson in England shortly afterward showed that iron filings or mercury could replace the water within the jar.
It may be synthetically obtained by distilling oxindole (C 8 H 8 NO) with zinc dust; by heating orthonitrocinnamic acid with potash and iron filings; by the reduction of indigo blue; by the action of sodium ethylate on orthoaminochlorstyrene; by boiling aniline with dichloracetaldehyde; by the dry distillation of ortho-tolyloxamic acid; by heating aniline with dichioracetal; by distilling a mixture of calcium formate and calcium anilidoacetate; and by heating pyruvic acid phenyl hydrazone with anhydrous zinc chloride.
He discovered that they had the power of affecting the electric conductivity of materials when in a state of powder, the majority of metallic filings increasing in conductivity.
An amorphous form results when a mixture of iron filings and sulphur are triturated with water.
Potassium ferric sulphide, K2Fe2S4, obtained by heating a mixture of iron filings, sulphur and potassium carbonate, forms purple glistening crystals, which burn when heated in air.
He discovered that heat is evolved when iron filings and sulphur are rubbed together to a paste with water, and the artificial volcan de Lemery was produced by burying underground a considerable quantity of this mixture, which he regarded as a potent agent in the causation of volcanic action.
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p their corners pared off by rubbing against each other; and two species of matter thus arise, - one consisting of small globules which continue their circular motion with a (centrifugal) tendency to fly off from the centre as they swing round the axis of rotation, while the other, consisting of the fine dust--the filings and parings of the original particles - gradually becoming finer and finer, and losing its velocity, tends (centripetally) to accumulate in the centre of the vortex, which has been gradually left free by the receding particles of globular matter.
Marconi, by giving great attention to details, improved the electromagnetic tapper, and, combining it with his improved form of sensitive tube, made a telegraphic instrument as follows: the small glass tube, containing nickel and silver filings between two silver plugs, was attached to a bone holder, and under this was arranged a small electromagnet having a vibrating armature like an electric bell carrying on it a stem and hammer.
The lines presented to the eye by the scattered filings are too vague and ill-defined to give a satisfactory indication of the field-strength (see Faraday, Experimental Researches, § 3 2 37) though they show its direction clearly enough.
Accordingly when he sprinkled iron filings on a card held over a magnet and revealed the curvilinear system of lines of force (see Magnetism), he regarded these fragments of iron as simple indicators of a physical state in the space already in existence round the magnet.
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The Campaign for Human Dignity is a tax-exempt, not-for-profit organization which has been warned by the state attorney general for improper tax filings.
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Missed or skipped payments and bankruptcy filings are evaluated along with on-time payments and paid accounts.
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These reports demonstrate that the number of marriages is declining more rapidly than divorce filings, and that divorce filings are remaining relatively stable.
Use with cream cheese, maple, orange, toffee, or other filings.
The grinding wheel is covered by a protective cap that serves a dual purpose - to control the amount of nail that gets filed away and to catch and hold the filings so you're not left with a dusty mess once you're finished.
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From deaths, divorces, marriage records, to births, business filings, property, unclaimed property, voters, government employees and missing persons, the list of public information databases is very long.
The number of bankruptcy filings for January 2009 reflected a 34.4 percent increase from the number of filings for the same time the year before.
Some officials question whether the company misrepresented the financial stability and condition of its mortgage loans in security filings, knowing the company was facing financial difficulties.
Traditional filings are created in the dentist's office, but these are made in a lab to ensure durability and a perfect fit.
Many organizations use volunteers to help out in the office with mailings and tasks such as filings.
Check with your city administration office for information on licenses, permits and fictitious name filings you need to run your particular type of business.
The state also has invested in state-of-the-art imaging equipment, to process new filings very quickly.
These summaries are necessary to complete required tax filings as directed by the IRS, no matter if you use a simplified Schedule C Form 1040 or more complicated tax reporting as required by larger companies and corporations.
For best results, consult a professional tax preparer for your first-year filings and to obtain the most deductions available.
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Boron hydride has probably never been isolated in the pure condition; on heating boron trioxide with magnesium filings, a magnesium boride Mg 3 B 2 is obtained, and if this be decomposed with dilute hydrochloric acid a very evil-smelling gas, consisting of a mixture of hydrogen and boron hydride, is obtained.
The interspace is filled with a very small quantity of nickel and silver filings, about 95 per cent.
The ordinary forms of metallic filings coherer of the Branly type require tapping to bring them back to the high resistance or sensitive condition.
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