Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 362
y brush M, which is positive; then from the lamps to the negative brush and around the loop, CDBA. When the loop is rotated one-half revolution, Fig. 317, 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 M,… … Fig. 316.—Simple Direct Current Dynamo. At the instant depicted in the revolutionbrush M is positive. is consequently always positive and brush P always negative,or the current in the external circuit is a direct current flowingin one direction onlv. 344 PRACTICAL ELECTRICITY. The act of…
Electricity · Magnetism
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