Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 442
amo-Electric Machinery. 419 a single commutator, which reversed the current once in each revolu-tion, which sent a continuous but varying current through the circuit.This slide (Fig. 13) is a Gramme machine, and was introduced tothe public shortly after 1870, and this machine has been the basis… … BlG. 14.—Ideal Gramme ring. armature, which rotates about the horizontal axis, and here is thecommutator. This next picture is an ideal Gramme ring (Fig. 14). Here areare the successive coils. Here is the south and here is the north poleof the ring. You will notice that in each coil, as it pa.sses…
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