Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 78
A. Gramme ring coil. B. Drum coil. Fig. 71.—Comparison between ring and drum coils. … A. Gramme ring winding. B. Drum winding. Fig. 72.—Comparison between ring and drum windings.
Electrical engineering
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