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 365
he number of coils is increased the commutatorsections are increased, as will benoted in the armatures depicted inFigs. 324, 325, and 329. An eight-coil ring armature is depicted inFig. 324, rotating against the-handsof a clock in a bipolar field. Theconnections are the same as thosegiven above.… … Fig. 323.—Four-Coil Gramme Ring Direct Current Armature. Whenflows inpositive brush, and returns from the external circuit to the DYNAMO ELEC7RIC MACHINES.
Electricity · Magnetism
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