Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 377
e slotted forthe reception of the conductorsand are called tooth-core armatures, Fig. 341. Mica tubes,formed by the aid of heat, from sheets built up of manythicknesses of mica united by shellac, etc., are fitted into the Flj 339.—Forged Copper Com-mutator Bar. 358 PRACTICAL ELECTRICITY, slots and… … BAMMICA HUB VWASMER Fig. 340.—Sectional View of a Commutator. by the armature; an ar-mature wound to develop1000 volts requiring abetter degree of insula-tion than one wound foronly 125 volts. Smoothcore armature bodies areused in some small ma-chines and are generallywound with several layersof…
Electricity · Magnetism
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