REACTION MACHINES

265

E, thus the magnetism produced thereby is a sine wave, $, 90°
ahead of E. The reactance is represented by the sine wave, x,

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V

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FIG. 129,—Wave shapes in reaction machine as generator.

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FIG. 130.—Wave shape in reaction machine as motor.
varying with the double frequency of E, and shown in Fig. 129
to reach the maximum value during the rise of magnetism, in