. The Street railway journal . BRICK CELLS CONTAINING 60,000-VOLT SWITCHES which revolves when the controller is advanced but not when itis being turned off. The motion of the controller drum can be. 60,000-VOLT SWITCH arrested at any point by the energizing of an electromagnet,which attracts this revolving armature. The upper part of theshaft, operated by the motormans controller handle, is notrigidly connected to the lower part, which is geared to the con- troller drum shaft, but is connected by means of a long, spiralspring, which allows the motorman to turn his handle con-siderably in adva
. The Street railway journal . BRICK CELLS CONTAINING 60,000-VOLT SWITCHES which revolves when the controller is advanced but not when itis being turned off. The motion of the controller drum can be. 60,000-VOLT SWITCH arrested at any point by the energizing of an electromagnet,which attracts this revolving armature. The upper part of theshaft, operated by the motormans controller handle, is notrigidly connected to the lower part, which is geared to the con- troller drum shaft, but is connected by means of a long, spiralspring, which allows the motorman to turn his handle con-siderably in advance of the controller drum. Consequently, themotorman can simply turn his handle from off to full onposition, and the controller drum will follow as far, and asrapidly, as the magnetic clutch will allow it to advance. Themagnetic clutch is energized from a small relay placed in thereverser under the car. This relay is connected in series withthe armature of one of the motors. When the current in anarmature exceeds a predetermined amount for which the relayis set, it closes the circuit through the magnetic clutch in thecontroller, and this stops the movement of the controller drumuntil the cur
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
