Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 134
-DETAILS OF GENERATOR POLE-PIECES. the boring of the concave cylindrical surfaces between which thearmature revolves. A point in favor of the cast iron pole-piece isthat the air gap may be made much smaller because of the greateraccuracy that can be secured by boring than by forming the pole-pieces…
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