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 50
LISTENINGKEV EXTENSIONSTATION … GENERATOR Fig. 2,950.—Two telephones wired so the extension may be cut in or out with the listening key,at will. The hand generator is used to call extension, making the set intercommunicatingwhen instruments are placed in different rooms. Operation is as follows: 1. With keynormal (as shown)…
Electrical engineering
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