Landis, Jesse A. [from old catalog] · Dayton, Ohio, U. B. publishing house · leaf 26
Fig. 12. Actions of Electricity. tive and one negative brush connected to the bars lead-ing to the coil in the slots half way between either setof poles. By referring to Fig. 13, we will see that the rotationof the armature draws the fields lines of force ahead … Fig. 13. or moves the field magnetic flux ahead from the trueposition of the pole pieces; this actual condition in anymachine is overcome by shifting the brushes on thecommutator back or forward until they do not spark,which position when found will be the true magneticfield. ALTERNATING CURRENT An…
Electricity
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