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 366
re in parallel with the brushes. As each coil passesfrom under tlie influence of the N-pole and comes intoaction under the S-pole, commutation takes place and thedirection of current through it is reversed,as will be seen fromtracing the directionof the currents in thetwo upper coils, whichare… … Fig. 324.—Eight-Coil Gramme Ring DirectCurrent Armature. short-circuit each coil for an instant as it passes from pole topole, and this short-circuiting should occur when there iszero E. M. F. in the coil, or at that instant wdien the mag-netic lines threading through it are a maximum, which will…
Electricity · Magnetism
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