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An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 387
Fig. 241 a. — Shaft with rotating field and exciter armature. Note gridsacross pole faces.Electricity · Magnetism
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