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 119
rt or spider, which consists of an iron hub ARMATURE CONSTRUCTION 331 with radiating spokes and a rim with provision for fasteningthe rings. The rim of the spider is provided with dovetailnotches into which fit similarly shaped internal projections on thecore segments. These features are shown in… … Fig. 364.—Built up core with four spoke spider, each spoke carrying two dovetail notchesIn this construction a little more air space is obtained for ventilation than where a separatespoke is provided for each notch. spider is an important point, for it must be done without reducingthe effective…
Electrical engineering
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