. American telephone practice . sistance betweenthe ring side of the outside line and ground, one of the bridge plugswill be inserted in the jack, c, while the other will be inserted in theground jack, g. The more modern wire chiefs desk equipment used by many ofthe Bell companies are shown in Figs. 468, 469, 470, 471 and Fig. 468 is shown the test trunk leading from the wire chiefsdesk to the test plug adapted to connect with the arrester springsat the main distributing frame. Remembering that the two outsidesprings of the arrester lead to the switch-board end of the line, whilethe two
. American telephone practice . sistance betweenthe ring side of the outside line and ground, one of the bridge plugswill be inserted in the jack, c, while the other will be inserted in theground jack, g. The more modern wire chiefs desk equipment used by many ofthe Bell companies are shown in Figs. 468, 469, 470, 471 and Fig. 468 is shown the test trunk leading from the wire chiefsdesk to the test plug adapted to connect with the arrester springsat the main distributing frame. Remembering that the two outsidesprings of the arrester lead to the switch-board end of the line, whilethe two inside terminals lead to the outside line, it will be seen thatwhen the connection is thus made with a line, the jack, /, affordsmeans for connecting directly with the switch-board line circuit, WIRE CHIEFS EQUIPMENT. 639 while the jack, /, affords means for connecting with the outsideline circuit. For the purpose of avoiding, as far as possible, any interruptionsin service while connection is made with a subscribers line, the. ! ,.■-.£ FIG. 468.—WIRE CHIEFS TESTING TRUNK. drops, D and D, are provided, which are under control of the insideand outside lines respectively. Thus, while such a connection is upat the main distributing board, if the operator at the switch-boardsends calling current out on the line, the drop, D, will fall, the ring-ing current passing through the coil of this drop and the condenser.
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