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
comes HAWKINS ELECTRICITY negatively electrified when rubbed with catskin, but positivelyelectrified when rubbed with silk. The nature of the electricity set free by friction depends onthe degree of polish, the direction of the friction, and the tem-perature. If two glass discs of different degrees…
Electrical engineering
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