. American telephone practice . ntrolling magnet to return the coin to the sub-scriber. In case the called-for party is secured, the coin is left infront of the window in the box, and is deposited by the falling ofthe next deposited coin. The electro magnet is not polarized, whichis an advantage in the point of simplicity. The holding of the coinin front of the window also has a tendency to prevent the illegiti-mate use of slugs to operate the device, as the holding of the slugin view of the public until the next call is made is likely to exposethe fraud. As by far the greater number of calls
. American telephone practice . ntrolling magnet to return the coin to the sub-scriber. In case the called-for party is secured, the coin is left infront of the window in the box, and is deposited by the falling ofthe next deposited coin. The electro magnet is not polarized, whichis an advantage in the point of simplicity. The holding of the coinin front of the window also has a tendency to prevent the illegiti-mate use of slugs to operate the device, as the holding of the slugin view of the public until the next call is made is likely to exposethe fraud. As by far the greater number of calls made are ter- MEASURED SERVICE. 473 minated successfully, it follows that in most cases the operatorhas no duties to perform in the operation of the Stroud device otherthan those imposed by ordinary flat-rate service. In the smallpercentage of calls, however, which are not successful, she pressesthe return button, which is the only extra duty imposed on theoperator as the result of this service. This represents the highest SOB5. o^£-/^L M g*— <^ * ^~itrr H — vwv- FIG. OF STROUD COIN-COLLECTING SYSTEM. development of coin-collecting devices that has been brought to theattention of the writer. One form of circuit arrangement proposed by Stroud for use withhis coin collecting device is shown in Fig. 346, this representing thesystem as applied to the Western Electric cord and line restoring magnet, A, of the coin box is included in series inthe line circuit at the sub-station, and for this reason it is made oflow resistance and is provided with a heavy copper covering lorthe core and with heavy copper spool heads for the magnet winding. 474 AMERICAN TELEPHONE PRACTICE. By this construction the magnet is made to have a very low co-efficient of self-induction so as not to materially interfere with thetalking efficiency. A pair of contacts, B, is adapted to make apassing contact between the ring side of the line and ground whena coin is deposited in t
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