Landis, Jesse A. [from old catalog] · Dayton, Ohio, U. B. publishing house · leaf 27
x 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 alternating current is a quantity of… … (VI AlternatorFig. 14. minute; the current which flows back and forth is inpractice divided as shown in Fig. 15, which is the timeof the coil to pass the distance of one set of field polesmaking one complete cycle or two alternations.
Electricity
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