Alternate-Current Machinery (Classic Reprint)

If the axis of rotation passes midway between the sides A and Bof the rectangle, the electromotive forces in both branches of the coil are added, and the total electromotive force at any moment is according to a well-known formular e= 27t nz -sin a (1), 2where nis the frequency (number of complete periods per second), Tis the number of wires in both branches A and Bof the coil collectively, zthe total induction through the coil when the latter stands at right angles to the lines of force, and a the angle between this position and the position at which the electromotive force eis generated. The relation between a and ,the time which was required to rotate the coil through this angle, is a =2 7t nt.
(Typographical errors above are due to OCR software and don't occur in the book.)

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