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 234
hes are set side by side. 143. Drum armature. Since very little flux passes acrossthe air space in the center of a Gramme-ring armature, thewires on the inner surface of the ring do not cut lines of magneticforce and are useless, except to connect the adjoining wireson the outer surface.… … Brush Holder Fig. 139. — Commutatorand brush with itsholder. 206 ELECTRICITY AND MAGNETISM which the wires lie (Fig. 140). Since the active wires in oneslot are connected across the end with active wires in anotherslot, there are no idle wires inside the core.
Electricity · Magnetism
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