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
tos. INTERIOR TELEPHONE SYSTEMS. 665. arrangement, as well as in the one shown by Fig. 38, the microphones,receivers, and microphone batteries are directly in series with the line, noinduction coils being used. Instead of vibrating bells and batteries for ringing, we may use a polar-ized bell, C,… … Fig. 39. Bridging System with Microphones and Magnetos. A better arrangement is to use high-impedance bells bridged across thetwo-line wires, as shown in Fig. 39. The generator, as explained in connec-tion with Fig. 36, is normally on open circuit. Three bridging methods are shown. At Station 1…
Electrical engineering
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