Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 41
eration of a simple and ingenidusinstrument, devised by Volta in 1775, for the purposeof procuring^ by the principle of induction, an unlimited CHAP. I.] ELECTRICITY AND MAGNETISM. 23 number of charges of electricity from one single charge.This instrument is the Eleotrophorus (Fig. 12). Itconsists… … liiiilB^^^ Xlg. 12 provided with a glass handle. Shellac, or sealing-wax,or a mixture of resin, shellac, and Venice turpentine, maybe used to make the cake. A slab of sulphur willalso answer, but it is liable to crack. Sheets of hardebonised indiarubber are excellent; but the surface ofthis…
Electricity · Magnetism
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