The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 95
wound onseparate bobbins and slipped over the cores as shown. Armature.—The armature should be of the best softiron, and of such form and mass asto embrace the greatest practicablenumber of lines of force, since itis itself a magnet during contact,and its force, whatever it may be,varies in the… … Fig. 32.
Electricity · Magnetism
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