Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 245
574,278, of Dec. 29, 1896. 234 Colics. [J. F. J., ing, described by Dieckmann-^ in a patent of 1H94, andshown in Plate XIII. This machine shows a three-ring-armature, the outer rings of which, Z^*-/, are wound withprimary, and the central ring F with secondary coils. Thiscentral ring is composed of… … 121
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