. Electric railway gazette . to prevent improper manipu-lation. The interlocking mechanism is also so arrangedthat a different throw is permitted to the brake cylinderwhen the car is going in one direction from that allowedwhen it is moving in the opposite direction. Underordinary circumstances it is unnecessary to arrange thebrake so that it will operate when the car is moving back-ward, as the backing of cars is contrary to the rules of moststreet railways, but in some cases where a car is run back- ward for a few feet, as on a switch or turnout, it is some-times necessary to stop abrupt. Fo
. Electric railway gazette . to prevent improper manipu-lation. The interlocking mechanism is also so arrangedthat a different throw is permitted to the brake cylinderwhen the car is going in one direction from that allowedwhen it is moving in the opposite direction. Underordinary circumstances it is unnecessary to arrange thebrake so that it will operate when the car is moving back-ward, as the backing of cars is contrary to the rules of moststreet railways, but in some cases where a car is run back- ward for a few feet, as on a switch or turnout, it is some-times necessary to stop abrupt. For making such emergencystops the brake is arranged so that where there are succes-sively graduated effects in applying it when running for-ward, this part of the cylinder remains idle when the car ismoving backward, and an auxiliary set of contacts comesinto play, which apply the full force of the brake at once. The general construction of the controller is shown inFigs. 1 and 2. With either the series-parallel controller or. the ordinary resistance switch the contacts upon the brak-ing switch cylinder co-operate with the contiolling cylin-der. These connecting contacts make possible an importanteconomy in the car wiring, as a considerable length of wirecan be saved in equipping the circuits of the controller, as shown in Figs. 1 and 2, is provided withtwo bolts serving as an interlock between the reversingswitch and the controller and between the brake switch andcontroller. Eugs secured to the controller case have open-ings wnich form guides for the interlocking bolts and theshaft of the controlling switch is provided with two notchedcollars, with which the ends of the bolts register. Thenotches indicate the off position of the controlling switch,and it is only in this position that it is possible to operatewith the brake or reversing switch. The circuits employed in the braking apparatus areshown in Figs. 3 and 4, in which A is the controlling switch,B the rever
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
