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 32
LI5TENIN6KLY RINGINGKEY EXTENSIONSTATION … -5— MAIN MAGNETOSTATION Fig. 2,928.—Wiring diagram showing two magneto instruments wired so that only one bellat a time can be rung by central. With the listening key normal, central can ring onlythe main station but the extension can talk, and throwing the listening key cuts off themain and allows…
Electrical engineering
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