Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 155
quired, one at each polar position in thecommutator, the two positive brushes being connectedtogether, and likewise the two negative. There are there-fore twice as manv current reversals at each revolution 132 ELECTRICITY FOR EVERYBODY. of the armature as in a two-pole dynamo having the samenumber… … Fig. 60. having the same number of armature coils, to producethe same number of current waves per minute. In likemanner any further increase in the number of poles canproduce a corresponding reduction of armature speed, asix-pole dynamo requiring only one third the speed, andan eight-pole dynamo…
Electricity
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