. The Street railway journal . istinct parts—the trolley contacts, the relay magnets and contacts, in a boxusually mounted on a pole near the switch, and the magnetsand lever mechanism, housed in a heavy cast-iron box, be-tween the rails near the switch tongue to be operated. The overhead contact is illustrated in Fig. 2. It consists ofa piece of galvanized sheet iron bolted around the trolley andinsulated from it. The two contacts are placed on the wire,20 ft. or 30 ft. apart. The box containing the relay magnetsis of such a shape that these magnets, with their respectivecontacts and blow out
. The Street railway journal . istinct parts—the trolley contacts, the relay magnets and contacts, in a boxusually mounted on a pole near the switch, and the magnetsand lever mechanism, housed in a heavy cast-iron box, be-tween the rails near the switch tongue to be operated. The overhead contact is illustrated in Fig. 2. It consists ofa piece of galvanized sheet iron bolted around the trolley andinsulated from it. The two contacts are placed on the wire,20 ft. or 30 ft. apart. The box containing the relay magnetsis of such a shape that these magnets, with their respectivecontacts and blow out coils, are carried one above another, sothat the box is but a few inches wide. Inside the cast-iron box placed in the street is a second boxcontaining two magnet coils. A common plunger for thetwo coils is so connected to the switch tongue that currentthrough one of the coils throws the switch one way, whilecurrent through the other throws it in the opposite direction. The instructions to motormen regarding the operation of. two sleeves or contacts on the trolley wire. It is evident thatwhile the trolley wheel of a car rests on one of the overheadsleeves, as is indicated in the drawing, any current used bythe car must pass through one or the other of the relay mag-nets. Assume that the controller is turned on when the trol-ley wheel is bearing on contact 31. Current through magnet28 lifts plunger 33, causing its upper end, 34, to make contactwith lug 35. When this contact is made, current from thetrolley flows successively through wire 32, and plunger 33,blow-out coil 36, wire 2)7, fuse 38, choke coil 39, and througha rubber-covered wire into an iron pipe, extending betweenthe box on the pole and the cast-iron box placed between therails near the switch tongue. Wire 29 entering the pipeemerges in the box previously referred to, and as wire 22continues through the winding of coil A and to ground on themagnet frame. When magnet A is excited the switch tongue,if not already thr
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
