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 50
of-plane is employedIt consists of a little disc of sheet copper or of gilt paperfixed at the end of a small glass rod. If this disc is laid 32 ELEMENTARY LESSONS ON [chat i. on the surface of an electnned body at any point, partof the electricity flows into it, and it may be then re-moved, and the… … Fig. i8. a proof-plane be applied to the outside of our electrifiedhollow ball, and then touched on the knob of an electro-scope, the gold leaves will diverge, showing the presenceof a charge. But if the proof-plane be carefully insertedthrough the opening, and touched against the inside of CHAP.…
Electricity · Magnetism
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