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 58
. 2,965the operators set, and fig. 2,966 shows how a coin machine is operatedin connection with the automatic system. Ques. Does the automaticresidence inter - communi-cating system differ from thecentral automatic system? Ans. Yes, although both areoperated with self-restoring in-ter-communicating… … SECONDARY COIL n/wwp PRIMARY COIL7 Fig. 2,963.—Wiring diagram of policesignal box, showing the bell and con-denser connected as usual across the linebetween L2 and G posts. The primary-coil is connected between its line andmiddle switch hook contact, the second-ary coil between the receiver and…
Electrical engineering
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