Gilley, Frank M · Boston, Allyn & Bacon · leaf 506
re.Either the field magnet or thearmature moves. In some dy-namos, whether direct or alter-nating current machines, thearmature revolves; in others,the field magnet revolves; in afew alternate-current dynamos,both the armature and the fieldmagnet are stationary, while amass of soft iron with… … Fig. 451. 496 PRINCIPLES OF PHYSICS.
Physics
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