Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 413
must be as many brushes as poles, except when thecommutator is cross-connected, page 333. 357. Principles of the Motor.—The principles involvedin the rotation of the armature conductors, when placed in amagnetic field, are fully discussed under the subject of elec-trodynamics, Lesson XXIII. It was… … Fig. 372.—Parts of a 20-H. P. Direct Current Slow .Speed Motor. K. W., 15. Volts, 250. Amperes, 60. Speed, 600 revolutions per minute. Average netweight, 2460 pounds. Diameter of pulley, 14 inches; face, 8 inches. effort was increased by increasing the number of loops orcoils and arranging them at…
Electricity · Magnetism
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