The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 577
same power or only requiring from ith toT^th the power for the same distance according to Fessenden. CHAPTER XXXV MISCELLANEOUS APPLICATIONS The Electrophone.—This is a special application of the tele-phone for the purpose of supplying connections to theatres,concert halls, etc., so that the… … Fig. 496.—Electrophone Combined Induction Coil and ConnectingSwitch. Scale J to the transmitters, as the latter have not been found to workso well by means of a battery stationed at the exchange, andit would be very inconvenient to have to send someone to thetheatres when it was desired to connect.…
Telephone
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