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 362
17, AB is now moving up past the N-pole and the di-rection of current in it is reversed. Its terminal, however, is not now in contact with brush J/, as before, but connected to brush P. Current flows to the external circuit from the brush M, which is still positive, though the current in the… … Simple Direct Current Dynamo. At the instant depicted in the revolutionbrush M is positive. 344 PRACTICAL ELECTRICITY. The act of commutation occurs at the instant when theWire, moving down past the S-pole, commences to move uppast the N-pole, either terminal of the coil being connected with one…
Electricity · Magnetism
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