The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 282
hen actuated by the insertionof the plug in the called-for subscribers jack, connects upthe clearing lamp Cl.L., to the centre of the differentialcoils of relay, D.R. The other connections will be readily understood fromprevious descriptions. Fig. 266 gives a photographic view of a section of… … 256 PRACTICAL TELEPHONE HANDBOOK every six panels, so as to enable the B operators to easilyreach every jack. As, with the exception of service-jacks, thosefor subscribers are the only jacks on the board, they canbe fitted low down so as to be easily reached. Each operators position is fitted with…
Telephone
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