Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 678
ith that whichwas shown at Station 1 in Fig. 37) in which a battery, £, and vibrating bell,V, are used for signaling, and an induction coil, 1, is added to the speakingapparatus. The primary of the induction coil is in series with the micro-phone transmitter, T, and its battery, MB., and the… … FlG. 40. Series Party System, with Induction Coils and SignalingBatteries. is up the signaling key, battery and bell are thrown out of circuit and themain circuit passes through only the telephone receiver and the secondaryof the induction coil. At Station 3 the connections are different ; when…
Electrical engineering
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