Telephones, their construction and fitting; a practical treatise on the fitting-up and maintenance of telephones and the auxiliary apparatus (1892)
Allsop, Frederick Charles · London, New York, E. & F.N. Spon · leaf 212
SWITCHBBflRD \BnfiTHy ST/IT/0/V_ A-^-f (r?n-Ei … |^^wl==^-r Jjour Telephone Stations ioonneoted to a central one with Switchboard. CONNEOTING-UP. 187 are received on the indicator and bell, and the number ofthe station ringing can at once be seen from the number of theV3,ne that falls. Either a mechanical replacement or pen-Fig. 178.° tNST N? I
Telephone
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