International Library of Technology · Scranton, International Textbook Co. · leaf 188
the E. M. F. which is setting up thecurrent. The positive half wave Off a is of almost exactly CURRENT APPARATUS. 2561 the same shape as the negative half wave a gg b in mostpractical cases. Induction-coils produce E. M. F.s whichhave different positive and negative half waves, but in thecase of E.… … Fig. 1434. the shape of the wave depending largely upon the construc-tion of the alternator producing it. Some of the more com-mon shapes met with are shown in Figs. 1434, 1435, 1436, and1437. Figs. 1434, 1435, and 1436 show the general shape ofthe waves produced by some alternators used largely for
Electrical engineering
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