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 366
Fig. 323.—Four-Coil Gramme Ring Direct Current Armature. Whenflows inpositive brush, and returns from the external circuit to the DYNAMO ELEC7RIC MACHINES. … Fig. 324.—Eight-Coil Gramme Ring DirectCurrent Armature. lower or negative brush, circulating up again through eachhalf of the armature. The windings in the halves of thearmature are in parallel with the brushes. As each coil passesfrom under the influence of the N-pole and comes intoaction under…
Electricity · Magnetism
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