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 31
e. STATIC ELECTRICITY 11 Gold Leaf Electroscope.—This form of electroscope, whichis very sensitive, was invented by Bennet. Its operation de-pends on the fact that like charges repel each other. The gold leaf electroscope as shown in fig. 11, is convenientlymade by suspending the two narrow strips… … Fig. 11.— Gold leaf electroscope; it consists of two strips of gold foil suspended from a brassrod within a glass jar. Used to detect the presence and sign of an electric charge. cork, which should be varnished with shellac or with par-affin wax. Through this passes a stiff brass wire, thelower end…
Electrical engineering
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