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By Silvanus P. Thompson

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Plained how Toward the close of Lesson certain bodies, such as the metals, Conduction of Electrification I. we ex- conduct by a Thread. while others are non-conductors or insulators. 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 electricity, ; ELECTRICITY AND MAGNETISM 34 [PT. i. 30 power of attracting light bodies. He found, similarly, that metallic wire and moist pack-thread conducted electricity, while silk did not.

Of The repelled charge is indeed repelled as far as possible into the walls of the room or, if the experiment be performed in ; the open air, into the earth. One kind of electrification only is under these circumstances to be found, namely, the opposite kind to that of the excited body, whichever this may be. The effect occurs in this case as if an electrified body had the same power of attracting earth. This up the opposite kind Art. 630). the electrons in the earth are attracted making of charge out of the easily explained by the electron theory (see According as the charge of the body be -f or -, is it up into the conductor, -, or they are repelled into the earth from the con- ductor, leaving it The quantity +.

For exact measurement, however, of the amount of charge recourse must be had to the instruments known as Electrometers, described in Art. 304, pp. 263-269. FIG. 13. Action of Electroscope. In another form of electroscope (Bohnenberger's) a single gold leaf used, and is suspended between two metallic plates, one of which can be positively, the other negatively electrified, by placing them in communication with the poles of a is "dry pile" (Art. 203). If the gold leaf be charged positively or negatively it will be attracted to one side or the other, according to the law of attraction and repulsion mentioned in Art.

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Elementary Lessons in Electricity and Magnetism by Silvanus P. Thompson


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