Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 39
ting a positivecharge to its under side, and repelling a negative charge to itsupper surface, as shown in fig. 21. STATIC ELECTRICITY 19 If, now, the cover be touched for an instant with the finger,the negative charge of the upper surface (which is upon theupper surface being repelled by the… … FlG. 24.—Lines of force of a charged sphere and a conductor under induction. The negativeelectrification on the end a of the cylinder indicates that a certain number of lines endthere, while the positive electrification on the end b similarly indicates that an equalnumber of lines set out from that…
Electrical engineering
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