Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 362
not now in contact with brush M, 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 armature Fig. 316.—Simple Direct Current Dynamo. has been reversed as in At the instant depicted in the revoluliou T. .… … ?44 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 brush for one-half revolution andwith the other brushfor the other half ofthe revolution.…
Electricity · Magnetism
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