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 313
ing out one battery are necessary ex-tending from one battery terminal to push. 2,404 HAWKINS ELECTRICITY must be reduced by step down transformers but the latter can only bereduced by the insertion of resistances. The direct current resistancesmay be electric lamps connected in series or they may… … Fig. 3,308.—Western Electric bell ringing transformer. A self contained unit for use on 60cycle alternating circuit of 100-125 volts. Delivers current at 6, 12, or 18 volts. Burglar Alarms.—A burglar alarm equipment consists ofmost of the apparatus required for regular electric call bell out-fits…
Electrical engineering
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