. The Street railway journal . tlyonly at one speed, whereas the direct-current series motor willoperate at high efficiency over a considerable range of speed. Itis, therefore, obvious that in railway service where the speed for August 31, 1901.] STREET RAILWAY JOURNAL. 231 many reasons has to vary during the run, and where cars arestopped and started at rather short intervals, the actual powertaken by the induction motor will be greater than that taken bythe direct-current motor. Since, furthermore, any induction mo-tor must take a certain amount of wattless current, the apparentpower input o
. The Street railway journal . tlyonly at one speed, whereas the direct-current series motor willoperate at high efficiency over a considerable range of speed. Itis, therefore, obvious that in railway service where the speed for August 31, 1901.] STREET RAILWAY JOURNAL. 231 many reasons has to vary during the run, and where cars arestopped and started at rather short intervals, the actual powertaken by the induction motor will be greater than that taken bythe direct-current motor. Since, furthermore, any induction mo-tor must take a certain amount of wattless current, the apparentpower input of the motor must be greater than with direct cur-rent. With the same mechanical clearance in the two types ofmotors, the amount of wattless current taken by the inductionmotor would be quite prohibitive; therefore these must be madewith decidedly smaller air-gap than direct-current motors, whichnecessitates more careful adjustment, and involves more repairwork. The wattless current is also dependent upon the voltage -S4-8C0()-.
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