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 64
BELL RINGINGBUTTON 5TATI0M I … STATION 3 Pig. 2,969.—Wiring diagram of the De Veau inter-communicating telephone system, one in-strument being shown diagrammatically. As many as six of these telephones can be con-nected in this way with individual ringing of each bell. The bell may have one gong, ortwo, as desired. In connecting…
Electrical engineering
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