Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910)
Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 177
he armature of the motorbeing taken from position so that coils are ac-cessible. Test out circuits of the excited fieldcoils with a magnet or compass. If a magnet benot at hand, take a small bolt or a small nail ofsufficient length to reach across the centers oftwo adjacent poles, and allowing one… … FlG. 215. — Testing outMagnetic Circuits. verse order, and repeat the experiment. Up to the point where the boltis not in contact with more than one pole, repulsion of the bolt will takeplace, but when the bolt is allowed to touch bothpoles, it will remain in contact. This is a simplemethod of…
Electricity · Electrical engineering
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