Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 68
Fig. 54.—Horseshoe type of Fig. 55.—Annular type ofelectromagnet. electromagnet. is little change in the flux threading the coil M and therefore onlya small pull; when the iron approaches close to the poles of themagnet, however, the flux increases rapidly and the pull, beingproportional to the…
Electrical engineering
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