mass, usually together by great washers, running upon oval or oblong cross-section, is attached screws cut on the axle of the armature. The size of the central hole in the plates solidly to each pole-piece, and the two are united at the top by a still heavier has been diminished, thus getting into… … PLAN Edison-Hopkinson Dynamo. pearance than before (Fig. 17). It may By these improvements, a machine occupy- be remarked, in passing, that the use of ing the same ground space, and of about multiple pillars of iron used by Edison the same weight as one of the older "L," in the "L," "K,"and "E"…
Engineering
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