Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 74
\ Fig. 29. Fig. 30. … a three-turn element for a wave winding, and Fig. 30 asimilar element for a lap winding. Winding pitches aresometimes, but not in this text, expressed by the numberof spanned core-slots or subtended angles at the axis, thelatter being expressed in radians or degrees either electricalor mechanical.…
Electric machinery
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