. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . he vertical magnet as the rotaryrelay RotRy does with the rotary magnet RM. The busy-test relay ByRytests the called line, furnishing busy tone and preventing the wiper-closing relay from connecting the wipers. The wiper-closing relayWCRy connects the line circuit to the wipers, starts the ringing inter-rupter, Ri. Int., grounds the private wiper PW, prevents further rotation,and cuts off the busy-test relay. The ring cut-off relay RCOR cuts offthe ringing current when the called station answers, and furn
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . he vertical magnet as the rotaryrelay RotRy does with the rotary magnet RM. The busy-test relay ByRytests the called line, furnishing busy tone and preventing the wiper-closing relay from connecting the wipers. The wiper-closing relayWCRy connects the line circuit to the wipers, starts the ringing inter-rupter, Ri. Int., grounds the private wiper PW, prevents further rotation,and cuts off the busy-test relay. The ring cut-off relay RCOR cuts offthe ringing current when the called station answers, and furnishespositive battery to the back-bridge relay BBR. 58 A UTOMA Tl( • TELEPHON V When the lineswitch connects a calling subscriber line to a connector,the line relay of the connector immediately pulls up and energizes therelease relay. The latter grounds the release trunk so that the lineswitchwill not release. This also makes the connector busy so that no otherlineswitch will seize it. Off NormalSprings StationeryDog InterrupterSprings Cam Line Wiper O ]^ VerticalMagnet RotaryMagnet. Line Bank Fig. 59.—Switch mechanism. When the subscriber dials the first digit of the call number, the line-relay armature vibrates one complete cycle for each unit in the it feeds current alternately to the release relay and to the verticalmagnet. The former is slow release, and remains energized throughoutthe series of pulsations which it receives. The vertical magnet is quick-acting, follows the impulses and lifts the wiper shaft. The series relay Se AUTOMATIC ELECTRIC COMPANYS APPARATUS 59 energizes with the first impulse and remains energized to the end of theseries of pulsations fed to the vertical magnet. The first upward step of the wiper shaft operates the off-normalsprings ONS. These springs prepare the release circuit (for the releasemagnet Rise), but action is prevented by the release relay (back contactopen). The off-normal springs also switch the impulse circuit of thev
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
