The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 538
h are out of the limit of a ncdfiHto.- single manual multiple board),and, in the case of large ex-changes, economy of first costand maintenance. Strowger System.—So far allinstallations of automatic ex-changes have been on the Strowger * system. Thissystem has been before thepublic for many years,… … Fig. 470.—SubscribersInstrument have attracted but little other at Hospital, attention. Subscribers Set.—The apparatus supplied to the subscribersconsists of the usual transmitter, receiver, ringer, inductioncoil and local battery, with the addition of calling or selector apparatus for sending the…
Telephone
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