International Library of Technology · Scranton, International Textbook Co. · leaf 25
footin diameter ; and a round disk A, of slightly smaller diam-eter, made of metal and provided with a glass handle. Inusing the electrophorus, the resinous cake must first be ELECTRICITY AND MAGNETISM. 1459 beaten or rubbed with a warm piece of woolen cloth or fur.The disk or cover is then placed… … Fig. 905. indeed, as to yield a considerable spark when the hand isbrought near it. The cover may be replaced, touched, andagain removed, and will thus yield any number of sparks ;the original charge on the resinous plate meanwhile remain-ing practically as strong as ever. !2!225. A static charge…
Electrical engineering
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