The Elements of Electric Lighting: Including Electric Generation, Measurement, Storage, and Distribution

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D. Van Nostrand, 1888 - 260 стор.
 

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Сторінка 71 - In the rotary movement of a ring-armntnre between opposite external pole-pieces, the lines of force, according to one theory, enter the armature-core and traverse the coils, producing an equal magnetic effect on every portion of each coil, interior as well as exterior. According to another theory, only the exterior portion of the coils cuts the lines of force; the interior portion, as well as that on the ends, being practically idle, serving only as a conductor of the electricity generated in the...

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