. The street railway review . causes current to flowthrough the closed circuit made by wires 3 and 2, including thesolenoids H and I Within these two solenoids are the plungerswhich lock the two semaphore plungers in position, by enterin.!?groves in the surface of the latter. When the current passesthrough the solenoids H and I, the plungers within them aredrawn inwardly, thus releasing the two semaphore plungers, whichimmediately drop of their own weight, at the same time making aquarter turn, and bringing both disks back to safety. This actionof course opens the circuit at E, and also permit
. The street railway review . causes current to flowthrough the closed circuit made by wires 3 and 2, including thesolenoids H and I Within these two solenoids are the plungerswhich lock the two semaphore plungers in position, by enterin.!?groves in the surface of the latter. When the current passesthrough the solenoids H and I, the plungers within them aredrawn inwardly, thus releasing the two semaphore plungers, whichimmediately drop of their own weight, at the same time making aquarter turn, and bringing both disks back to safety. This actionof course opens the circuit at E, and also permits the switch tongueB to fall, leaving the signals ready to be actuated by the followingcar. The other set of signals is operated by a car going in the oppositedirection. The object of the relay at A is to preserve the current in thesignal circuit until all the necessary movements have taken placeAt the first impulse of the current the two magnets forming therelay attract the bar beneath them, thus closing the circuit and in-.
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
