. American telephone practice . MEASURED SERVICE. 465 tery system, and makes known to the operator the number of thesubscriber with whom he desires a connection. The operator thenmakes the connection with the called subscriber, and upon securinghis response notifies the calling subscriber to deposit a coin of theproper denomination. She is notified of his compliance by hear-ing the characteristic sound of that coin, after which she allowsthe conversation to progress. An extensive line of purely mechanical coin-collecting devices is

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