The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 580
nt the transmitted soundswill be most intense from thatone of the two transmitters which Fig.is nearest the singer on the stage,so that a distinctly different result is obtained from the tworeceivers of each pair. The effect produced is somewhatanalogous to the action of a stereoscope in giving… … 499.—Double Receiverfor Electrophone 552 PRACTICAL TELEPHONE HANDBOOK the telephone for the purpose of joining up branch fire andpolice stations, and also for the purpose of giving alarms offire, etc., by the general public. For the latter purpose thetelephone has the advantage over ordinary…
Telephone
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