. Electric railway journal . the resistance inserted inthe rotor which in its turn decreases the power ab-sorbed; vice versa, when the power absorbed tends todecrease, the regulator rotates in the other direction,thus keeping the amount of power taken by the motor ata constant value. Besides the controller and liquid rheo-stat, the locomotive is equipped with the usual auxiliaryapparatus and instruments. There is, however, in addi-tion, a small transformer to change the power supplyfrom three to two-phase. Fig. 2 shows the connection between the overheadline and the primary switch through the
. Electric railway journal . the resistance inserted inthe rotor which in its turn decreases the power ab-sorbed; vice versa, when the power absorbed tends todecrease, the regulator rotates in the other direction,thus keeping the amount of power taken by the motor ata constant value. Besides the controller and liquid rheo-stat, the locomotive is equipped with the usual auxiliaryapparatus and instruments. There is, however, in addi-tion, a small transformer to change the power supplyfrom three to two-phase. Fig. 2 shows the connection between the overheadline and the primary switch through the trolley, im-pedance coils, and oil switch; also the circuit supplyingthe auxiliary apparatus with fuses, lightning arresters,and transformers. The three phases consist of twooverhead wires and the rails or ground phase. Thereare, as already mentioned, four connections of windingsand motors to obtain the four running speeds. Twoconnections are shown in Fig. 3; that is, the three- 284 ELECTRIC RAILWAY JOURNAL [Vol. XLV, No. 6.
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