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 33
•^ … Figs. 13 and 14.—Electrification produced by rubbing dissimilar bodies together and thenseparating them. If the insulated glass and leather discs A and B be rubbed together,but not separated, no signs of electrification can be detected; but if the discs be drawnapart a little distance the space…
Electrical engineering
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