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
LX TENDONKINlilN6 KEY £ … ■rorfes Fig. 2,929.—Wiring diagram showing three magnetos wired so that only one bell at a time canbe rung by central (according to which listening key is thrown) but one can talk from anyone of the three instruments when the keys are normal. If either listening key be thrownso that the swinging…
Electrical engineering
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