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 404
Fig. 366.—Series Dynamo. ■The fields are in series with the afma-A-Fig.360. ture. DIRECT CURRENT DYNAMOS. 385 … method the armature used is of the open coil type, % 331, andthe position of the brushes is automatically moved so as to bein connection with the armature coils while they are passingthrough any stage of induction, from the points of maximuminduced E. M. F. to the minimum, or neutral points.…
Electricity · Magnetism
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