The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 579
550 PRACTICAL TELEPHONE HANDBOOK vibration, and may be fitted on a bracket at the wings orplaced on the stage of the theatre. A height of about 3 feetabove the stage is found to be best for transmission. Receivers.—The receivers used are of the Ader type, a pairbeing mounted on the ends of a spring… … Fig. 498.—Complete Electrophone Transmitter on Weighted Base separate circuit, so that 4-way cords and jacks are used forconnection. Several of such pairs are connected up in twocircuits, one receiver of each pair being in each circuit, so thatif anything should go wrong with one of the circuits a…
Telephone
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