Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 125
dely varyingvoltage. The method is still used in special cases and for smallmachines. Such a winding has rarely, if ever, been made withone continuous wire. ARMATURE CONSTRUCTION 337 Evolute or Butterfly Winding.—This mode of winding,was introduced by Siemens for electroplating dynamos to over-come… … Fig. 371.—Holzer Cabot armature; rear view showing back head and coil guard. The con-struction of core and winding is described in fig. 367. The shaft is of crucible steel groundto gauge. The commutator segments are of drop forged copper in the smaller and hard-drawn copper in the larger sizes. The…
Electrical engineering
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