. American telephone practice . inserted into the jack belonging to anyother station the pressure upon this key will cause the bell to soundat that station. In this way a call may be received or sent. Whenthe hook-switch is raised the transmitter of a station is connectedbetween the battery wire and common-return wire, so that all of thetransmitters at the stations in use take current from the same batteryin multiple. In order to reduce cross-talk between two or more pairs of sta-tions which happen to be communicating at the same time, the smallimpedance coils, c c, are placed in each side of
. American telephone practice . inserted into the jack belonging to anyother station the pressure upon this key will cause the bell to soundat that station. In this way a call may be received or sent. Whenthe hook-switch is raised the transmitter of a station is connectedbetween the battery wire and common-return wire, so that all of thetransmitters at the stations in use take current from the same batteryin multiple. In order to reduce cross-talk between two or more pairs of sta-tions which happen to be communicating at the same time, the smallimpedance coils, c c, are placed in each side of the transmitter cir-cuit at each station, and between their terminals, as shown, isbridged at each station a condenser, C, so as to afford a local circuitfor the vibratory currents set up by the transmitter. The coils, c,tend to prevent the fluctuations in current produced in any trans-mitter from backing up through the battery wire and common-return wire into the local circuits of the other transmitters. Flue- rlMl T^TUifefc?.
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