The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 515
ulated Co. in the various towns alreadymentioned. The sections of the board are 3-panel ones similarto those shown in Fig. 268, each separated from the next bysingle panels on which are fitted ticket racks, switches, relayand spare receivers for the trunk-line operators, as shown inFig. 456, which… … Fig. 456.—A Pair of Trunk Panels, with Intermediate TelegraphCall Arrangement {Reproduced from Electrical Engineering by permission of the Proprietors) The trunk panels are each fitted for 5 trunk lines as usual,the double jacks and lamps for these being fitted in the lowerpart of the panel with…
Telephone
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