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
er plan of wiring two instruments. Fig. 2,952shows how a private line telephone may be wired through a P.B.X.switchboard. Fig. 2,953 shows a booster set for special long distance work on commonbattery telephones; fig. 2,954, a similar arrangement but connecteddifferently. Ques. What is used with… … MAIN5TATI0N RINGINGKEY GENERATOR Fig. 2,949.—Method of wiring three telephones so that only one bell at a time can be rung bycentral (according to which listening key is thrown) but one can talk and listen from anyone of the three instruments when the keys are normal. The diagram shows these keys…
Electrical engineering
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