. Electric railway journal . running position, the handle restsagainst a slightly raised stop in the top of the con-troller, so that the weight of the motormans hand suf-fices to hold it there. For switching off the current themotorman has only to release the handle, when it willbe swung backward by a spring which exceeds the re-sistance of the stop previously mentioned, thus freeingthe ratchet mechanism and allowing the main cylinderto return to its initial position. In this way, the ar-rangement embodies also the features of the deadmans handle. The circuit-breaking relay is a solenoid inser
. Electric railway journal . running position, the handle restsagainst a slightly raised stop in the top of the con-troller, so that the weight of the motormans hand suf-fices to hold it there. For switching off the current themotorman has only to release the handle, when it willbe swung backward by a spring which exceeds the re-sistance of the stop previously mentioned, thus freeingthe ratchet mechanism and allowing the main cylinderto return to its initial position. In this way, the ar-rangement embodies also the features of the deadmans handle. The circuit-breaking relay is a solenoid inserted intothe main circuit. Above a certain maximum currentvalue this relay will open a contact and interrupt thecontrol current. A voltage coil upon the same magnetcore is placed under current in the out position ofthe relay and fixes the relay there until the master con-troller is brought back into its initial position. Thesafety fuse box has a horn air gap combined with apowerful magnetic blow-out action. The motor cut-out. Ueberetsch Railway—1200-Volt Motor switch is a contact drum between two rows of contactfingers and needs no further description. The controlcurrent converter is a small machine of about 500 wattsoutput with two independent armature windings andtwo commutators, one for 600 volts and the other for100 volts. The field is excited from the 600-volt permanent resistance is inserted in series with thearmature, as it is essential that the converter may becut in instantaneously. Two of these converters areconnected in series across the line potential; they arecombined with a separate cut-out switch, by which oneof the two may be thrown out of circuit in case of fail-ure and replaced by a conveniently connected resist-ance in such a way that operation might be continuedwith the remaining converter. The lightning arrester is located on the roof. Itconsists of a horn air gap with magnetic blow-out com-bined with a carborundum grounding resistance. Thetwo
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
