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 369
ted in series and to the commutator in the same manner as that given forthe ring armature. Fig. 330depicts a four-coil Siemensdrum armature with its com-mutator, suitable for a bipolarfield. In practice a greatmany coils are wound* uponthe core covering its entirearea, the commutator… … Fig. 330.—Four-Coil Siemens DrumArmature. coil so that the two E. M. F. tive coils in the ring armature. Both halves of the drumarmature coils are in parallel with the external circuit so that DYNAMO ELECTktC MACHINES. Sol the induced E. M. F. .is that generated by one-half ofthe total conductors…
Electricity · Magnetism
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