Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 218
crossing the airgap are spaced as shown in Fig. 211, and the e.m.f. in a conductor,being proportional to the rate of cutting of lines of force, variesas in curve A. By shaping the pole face, however, as in Fig. 212,the flux density in the air gap and therefore the rate of cutting oflines of force…
Electrical engineering
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