Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 271
Two-circuit, Multiple-wound, Drum Armatures.— With thesame symbols as before, and m =r number of windings, the general formulais c =: n y ± 2 m. … ARMATURES. 259 This is a large class, and many combinations have been worked, Figs. 53and 54 showing two of the simpler ones ; the first a two-circuit triple wind-ing, and the second a two-circuit double winding.
Electrical engineering
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