Landis, Jesse A. [from old catalog] · Dayton, Ohio, U. B. publishing house · leaf 29
n their conditions; an alternatingcurrent generator must have its field circuit suppliedwith a direct current from a direct current generatoror some other outside source, so the magnetic lines offorce in their circuit will flow in the same direction. It is practical in most cases to charge the… … Fig. 16. that each alternation per cycle flows in the same di-rection instead of reversing its flow. This conditioncan be obtained by placing on the shaft of the motor(or generator for a series field winding only) a com-mutator with as many bars as there are field poles onthe machine, as shown in…
Electricity
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