. The practical telephone handbook and guide to the telephonic exchange . 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 fork, as shown in Fig. 499,each one being fitted with a swivel joint, so that it can beadjusted to the listeners ear. Each receiver is kept in a. Fig. 498.—Complete Electrophone Transmitter on Weighted Base separate circuit, s
. The practical telephone handbook and guide to the telephonic exchange . 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 fork, as shown in Fig. 499,each one being fitted with a swivel joint, so that it can beadjusted to the listeners ear. Each receiver is kept in a. 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 receiverof each pair would probably be still left working. The transmission lines terminate in jacks at the centralstation, and when more than one subscriber is connectedthrough to a transmitter the connections are made through acondenser inserted in each leg of every line connected. This MISCELLANEOUS APPLICATIONS 55i is done to equalise the volume of sound to long and short lines,and also to prevent an earth fault on any one line affectingthe transmission to the other lines connected. Paris Theatrephone.—The arrangements used in Paris aresufficiently interesting to justify a description. Ten Ader transmitters, t, t, t, t, t, and t, t, etc., are fixed onthe stage, as shown in Fig.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
