Download PDF by Silvanus P. Thompson: Elementary Lessons in Electricity and Magnetism

By Silvanus P. Thompson

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47), thus producing a continual loss of charge. , The density of a charge upon a flaL (of) Flat Disk. disk is greater, as we should expect, at the edges than on the flat surfaces; but over the Hat surfaces the distribution is fairly uniform. ese various facts are ascertained by applying a small proof-plane successively at various points of the electrified bodies and examining the amount taken up by the proof-plane by means of an electroscope or electrome- Coulomb, who investigated mathematically as well many of the important cases of distribution, employed the torsion balance to verify his calcu- ter.

Specific inductive capacity, see Art. ) . are now prepared to Electrophorus. explain the operation of a simple and ingenious instrument, devised by Volta in 1775, for the purpose of 26. The by the principle of influence, an unlimited of charges of electricity from one single charge. procuring, number This instrument* the Electrophorus (Fig. 20). It round cake of resinous material cast in a metal dish or "sole," about 12 inches in diameter, and a round disk of slightly smaller diameter consists of made two is parts, a of metal, or of wood covered with tinfoil, and provided with a glass handle.

Conduction and Distribution of Electricity Toward the close of Lesson I. we Conduction. how certain bodies, such as the rnetals, conduct electricity, while others are non-conductors or insulators. 30. explained This discovery is due to Stephen Gray; who, in 1729, found that a cork, inserted into the end of a rubbed glass tube, and even a rod of wood stuck into the cork, possessed the power of attracting light bodies. He found, and pack-thread conducted similarly, that metallic wire electricity, while silk did not.

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Elementary Lessons in Electricity and Magnetism by Silvanus P. Thompson


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