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Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 522
Fig. 486.—Armature Core. Fig. 4S9.—End View of Armature, showingCommutator. Fig. 490,—Brush-holding Disk.Physics · Lantern projection · Electric apparatus and appliances
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