. American telephone practice . rcuit from the ring side of theline to the magnet includes also the pair of contacts, e2, c2, closed bythe deposit of the coin. A subscriber desiring to make a call does so, not by raising hisreceiver from its hook, but by dropping a coin of the proper de-nomination, usually a nickel, in the slot. This coin rests betweenthe pins, e and c2, of the box, and closes the contact to groundthrough the magnet, /, as shown diagrammatically in Fig. 344. Thiscompletes the circuit through the line relay, using ground return,and the line lamp is lighted in the usual manner.
. American telephone practice . rcuit from the ring side of theline to the magnet includes also the pair of contacts, e2, c2, closed bythe deposit of the coin. A subscriber desiring to make a call does so, not by raising hisreceiver from its hook, but by dropping a coin of the proper de-nomination, usually a nickel, in the slot. This coin rests betweenthe pins, e and c2, of the box, and closes the contact to groundthrough the magnet, /, as shown diagrammatically in Fig. 344. Thiscompletes the circuit through the line relay, using ground return,and the line lamp is lighted in the usual manner. The current flow- 470 AMERICAN TELEPHONE PRACTICE. ing over the tip side of the line does not operate the magnet, frin either direction because it is too feeble to do so. In response to the line signal the operator inserts an answeringplug, thus cutting off the circuit through the line signal by meansof the cut-off relay. The operator then converses with the sub-scriber, calling in the usual manner, and completes the connection. FIG. 344.—CIRCUIT OF SCRIBNER COIN-COLLECTING SYSTEM. between his line and that of the called subscriber by means of thecalling plug. When the called-for subscriber responds, the oper-ator, noticing the going out of the calling supervisory lamp, pressesthe key, K, which interrupts the conversation between the two sub-scribers, if it has begun, and connects the negative pole of a no-volt battery with the tip side of the line. The current thus flowsfrom ground at central office, through this side of the line to groundthrough the magnet, f, of the coin device, which latter magnet is MEASURED SERVICE. 471 then actuated to withdraw the pin e2 from under the coin, throwingthe coin into the cash box. If, however, the called-for subscriberdoes not respond, or if his line is busy so that the operator cannotat the time make a connection with it, she depresses the key, Kwhich connects the positive pole of the no-volt source of currentwith the tip side of the lin
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