The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 197
172 PRACTICAL TELEPHONE HANDBOOK latter are connected to the inner springs of the jacks. Theshort outer springs are also connected to the plug-tip strandof the connecting cord, and the long spring to the sleevestrand of the cord. Each line has thus a connecting cord andplug permanently joined, and… … EXCHANGE LINE Fig. 196 the called-for number, the drop of the latter being disconnectedby the raising of the jack springs from the inner springs. Thedrop of. the calling line serves as the ring-off or clearing signal,being connected as a shunt to the main loop-line circuit. Thedrops are wound to…
Telephone
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