. American telephone practice . 739 ■40 AMERICAN TELEPHONE PRACTICE. tuations produced in the local circuit of any transmitter act in-ductively through the induction coil, /, upon the talking circuitcontaining the receiver, the circuit being completed between twostations by the common-return wire and the wire of the station been called. This arrangement necessitates the removal of theplug when through talking, as otherwise both of the stations con-nected would be rung up when either of the stations was called. The Holtzer-Cabot Electric Company has overcome the difficultydue to the su
. American telephone practice . 739 ■40 AMERICAN TELEPHONE PRACTICE. tuations produced in the local circuit of any transmitter act in-ductively through the induction coil, /, upon the talking circuitcontaining the receiver, the circuit being completed between twostations by the common-return wire and the wire of the station been called. This arrangement necessitates the removal of theplug when through talking, as otherwise both of the stations con-nected would be rung up when either of the stations was called. The Holtzer-Cabot Electric Company has overcome the difficultydue to the subscriber calling leaving his switch lever in the wrongposition, by the apparatus shown in Fig. 524, this device being the. FIG. 524.—NESS AUTOMATIC SWITCH FOR HOUSE SYSTEMS. invention of Mr. T. W. Ness. The arrangement is such that whenthe subscriber hangs up his receiver the switch arm, which is underthe influence of a spring, will be automatically released and will flyback to the home position without his volition. In the figure theswitch-restoring mechanism is mounted on the inside of the coverof the box, the switch lever itself being mounted on the oppositeside. The lever, L, at each station, shown in diagram in Fig, 525,is adapted to slide over the buttons, 1, 2, 3, and 4, as in the systemsalready described. The curved contact-piece, D, is so arranged thatthe lever will not normally engage it, but by pressure upon the INTERCOMMUNICATING SYSTEMS. 741 handle of the lever it may be brought into engagement with the con-tact. Referring again to Fig. 524, H is the hook-switch adapted to per-form the ordinary functions of connecting the calling and talk-ing apparatus alternately in the line circuit. The s
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