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 235
Fig. 140. — Slotted armature core, drum type. Partly wound. 144. Field magnets. The magnetic field in which the arma-ture revolves is ordinarily produced by a great electromagnet.The frame of this electromagnet (Figs. 141 and 142) is so ar-ranged that it can hold the windings required to set up the… … <^*L¥=ii
Electricity · Magnetism
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