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 26
Figs. 2 and 3.—Pith ball pendulum or electroscope; the figures illustrate also electricalattraction and repulsion. other, that which is transversely rubbed is negatively and theother positively electrified. If two bodies of the same sub-stance, of the same polish, but of different temperatures,…
Electrical engineering
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