. Electric railway journal . ce. This current regulatormakes it practical to use an all-light signal for day aswell as night indication with the lamps fed from thetrolley voltage, for the candle-power remains constantin the lamps. A high-speed contactor of very simple design is usedwith no side contact strips or other parts in the path ofthe trolley wheel to cause shock and uncertainty of con-tact at high speed. The contactor is placed on an ordi-nary ear and guyed into position so that the weightof the span hangs from the contactor, and this weightrests upon an adjustable spring in the contac
. Electric railway journal . ce. This current regulatormakes it practical to use an all-light signal for day aswell as night indication with the lamps fed from thetrolley voltage, for the candle-power remains constantin the lamps. A high-speed contactor of very simple design is usedwith no side contact strips or other parts in the path ofthe trolley wheel to cause shock and uncertainty of con-tact at high speed. The contactor is placed on an ordi-nary ear and guyed into position so that the weightof the span hangs from the contactor, and this weightrests upon an adjustable spring in the contactor whichis adjusted to carry all but about 10 lb. to 12 lb. ofthe total weight of the span. As the trolley wheel withthe pole tension on it comes under the contactor, someof the weight of the span is relieved, and the springmoves a plunger upward. Near the end of its upwardstroke, the plunger unlatches a gravity-operated con-tact arm which falls and makes the two contacts inpredetermined sequence. As these two contacts must. FIG. 4—HIGH-SPEED CONTACTOR FOR TYPE N SIGNAL,SHOWING COVER OPEN be made almost instantly one after the other, the con-tact arm is operated by gravity to give the same speedeach time, and as the trolley wheel operating the con-tactor simply unlatches this contact arm, the actionof the arm is always the same regardless of the speedof the car. As the trolley wheel leaves the contactor,the plunger of the contactor moves downward, liftingthe contact arm into operating position again and re-latching it. As the contact arm is only unlatched near the endof the upward stroke of the plunger of the contactor,it will not be operated by any swaying of the trolleywire such as might be caused by a trolley pole flyingoff and striking a nearby span wire. The contactoris so designed that expansion and contraction of thetrolley wire does not affect its operation nor does creep-ing of the trolley wire. It has been successfully triedout in high-speed service for the past ye
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