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 167
sed externally. It consists of a flat steelspring secured at one end, with the other free to vibrate. At apoint about midway between its ends, contact is made with thepoint of an adjusting screw, from which it springs away andreturns in vibrating. The points of contact of blade and screware tipped… … Fig. 142.—Construction of condenser for an induction coil. The conducting material usedis tinfoil, of which a large number of sheets are prepared, all cut to the same size. Theseare placed, one on top of the other, like the pages of a book, with a thin layer of insulatingmaterial between, usually…
Electrical engineering
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