Trebel, George. [from old catalog] · New York, F. Tousey · leaf 46
produced in asingle helix. During the second quarter revolution the poles approachone another, and the effect would be to reverse the current;but the polarity of the wires also change, as they are nowbrought under the influence of the poles which they are ap-proaching, and this double change leaves… … revolution there would be a current half of the time in one direc-tion and half of the time in the opposite direction. In order tosecure a constant current in one direction a current reverser,I, or commutator, as it is called, attached to the axle, is so ar-ranged that the current is reversed at…
Electricity
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