. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . m,and is suitably interconnected, asindicated In Fig. 22, which .showsthe contact rings of the controlleras they w^ould appear if rolled out (hit. Contact fingers are placedalong the left side of the controller, as seen in Fig. 21, one for eachring on the drum; and as the controller handle is turned to revolvethis drum, the contact fingers make contact with the rings on thedrum and give the various connections. Alon
. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . m,and is suitably interconnected, asindicated In Fig. 22, which .showsthe contact rings of the controlleras they w^ould appear if rolled out (hit. Contact fingers are placedalong the left side of the controller, as seen in Fig. 21, one for eachring on the drum; and as the controller handle is turned to revolvethis drum, the contact fingers make contact with the rings on thedrum and give the various connections. Alongside the main con-troller drum is a reverse drum which simply reverses the armatureconnections of the two motors. L-KV^M iiiP;ir:ill. 20 ELECTUIC RAILWAYS Controller Wirinjj. Ilio connection 1)0t\V(MMi motors, con-t]-o]lers, and resistances, with two motors and a K (» controller isshown in Fig. 22. A carefnl stndy of this will show the combinationsto be the same as indicated in the diagram, Fig. IS. Jhe wiringis rather complicated; and in practice, to avoid confnsion, the endsof each wire are labeled with tags showing the terminals to whichthev S5^*= FiK-2I. (imtrollcr. With the aid of Figs. 22, 2)) and 24, the wiring of a type K 0controller with two motors may ])c followed. Figs. 2A and 24 arefor a different controller bnt can be used to assist in an understandingof the complicated diagram 22. The current leaves the choke orkicking coil of the lightning arrester and passes through the blowout coil of the controller. It then goes to the top finger T of thecontroller. On the first point the circuit is as shown in Fig. top segment A. makes contact with the top or trolley finger.
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