. Electric locking . to negative side of battery. Whenthe stick relay is thus picked up it will remain so through wire 52 TRAP CIRCUITS 7, its own front point, wire 8, coils of relay and wire 6 back tobattery. With the train entering section B the current isshunted out of the relay through wire 7, its own front point andwires 8 and 5, wheels and axles of train and wires 9 and 6. Itshould be noted that inthis scheme all circuit breaking throughthe track relay should also break through a back point of thestick relay C. Like all open circuit schemes, the present cir-cuit is susceptible to derange
. Electric locking . to negative side of battery. Whenthe stick relay is thus picked up it will remain so through wire 52 TRAP CIRCUITS 7, its own front point, wire 8, coils of relay and wire 6 back tobattery. With the train entering section B the current isshunted out of the relay through wire 7, its own front point andwires 8 and 5, wheels and axles of train and wires 9 and 6. Itshould be noted that inthis scheme all circuit breaking throughthe track relay should also break through a back point of thestick relay C. Like all open circuit schemes, the present cir-cuit is susceptible to derangements characteristic of such circuitarrangements, and cannot be classed as perfectly reliable underall conditions. An open circuit scheme is, as previously discussed,based on the wrong principles, as there is nothing to give assur-ance that the stick relay will perform the duty to which it isassigned. For example, a break in a wire would impair its use-fulness. The relay, being normally de-energized, will, of FIG. 48. effect a saving in the battery consumption. By controlling thebridge shunt wires through the stick relay, the trap circuit willalso keep the track relay down while the stick relay is trap circuit taking effect only when trains move in onedirection is shown in Fig. 48. A train moving in the direction ofthe arrow will, when entering into section A, shunt track relayC and stick relay D through the following circuit: Frombattery F, wires 1 and 2, track connection 3, rail 4, wheels andaxle of train, rail 5, track connection 6, wire 7, front point of re-lay F, wires 8 and 9, front point of relay D and wire 10 backto battery. Relays C and D remain de-energized until thetrain has entered section B and dropped relay E for this sec-tion. Relay C will not pick up until relay D is energized, forthe reason that with relay D dropped, battery positive is appHed S3 ELECTRIC LOCKING to both rails in track circuit A, one rail being fed directly frombatter
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
