Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 377
to be wound upon the core, Fig. 342. The insulation is pierced and the wedges driven into the slots. The quality of an insulating material is Fig. 341.—Tooth-Core Armature Bodytested by subjecting With Formed Coils in Position. it to a high potential and ascertaining at what voltage conducts,…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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