The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 551
Fig. 482.—Third Selector, South Office, Los Angeles … Fig. 483.—Connector, South Office, Los Angoles A UTQMA TIC EXCHA NGES 523 being brought into action successively by the aid of the twodirectly connected ones. Figs. 480, 481, and 482 show detailsof the connections of the No. 1, 2, and 3 selectors; Fig. 483 of PRIVATE BACKRELEA3S MAGNET RELAY
Telephone
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