The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 229
ed is similar to the 3-way plug, but the ring isnot furnished with any connection to the body of the plug. Line Connections.—Fig. 228 shows the connections of theline and test wires to the jacks, and also to the self-restoringdrop shown in Figs. 161 and 162, and already described in203 204… … TEST WW V/ c Fig. 228 earthed battery, b, this being also connected to the centre ofthe operators receiver coils. On the insertion of a plug into a jack, the springs t and tare connected together by the collar t of the plug, so that LINE 972
Telephone
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