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 392
anE. M. F. of 125 volts, a four-pole dynamo ofequal output will run at only 500 revolu-tions ; one of eight poles, at only 250 rev-olutions per minute. Many four-pole fieldyokes are octagonal, but wdien more poles arerequired the ring form is used. The fieldmagnet cores are generally cylindrical… … Fig. 358.—Multi-polar Field Ring. form and taining a quality of This is a much cheaper forged from wrought iron. ?ores are cast-welded into the plain cast iron field ring, which, in the larger sizes, is generally divided into two parts, 374 PRACTICAL ELECTRICITY. for convenience in handling. The…
Electricity · Magnetism
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