Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 174
from the adjacent magnet pole througheach armature coil, and the E. M. F. is zero, the reversalin the direction of the current taking place at this moment.As each mass K moves onward, the air gap increases, andthe number of lines of force from, say, an S pole, threadingan armature coil, is… … Fig. 56. 172 MODERN ELECTRICITY sets of lines of force, equal in number, opposite in direction,pass through the armature coil, and the E. M. F. is at itsmaximum. The keepers are rotated at the speed necessary to producethe desired rate of alternation or periodicity. If the revolvingpart is truly…
Electrical engineering
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