Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 65
Solenoid M … Fig. 48.—Automatic circuitbreaker. Fig. 49.—Electromagnetic motor. 50. Laws of Magnetic Pull.—The law of inverse squares, art.2, page 1, applies only to imaginary point magnets; in prac-tical work the following laws are applied. The force on a piece of iron in a magnetic field in air tends tomove…
Electrical engineering
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