Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 515
^ d, maywith advantage be larger. The size of the wire on the mag-net and armature ma) be varied for some special purpose,but for general use the sizes here given are recommended.The slit in the commutator should be made slightly diagonal,so that one section of the copper ferrule will touch… … Armature and Commutator—Longitudinal Section. bing. The parts indicated as brass or copper should bemade of these metals, as a magnetic insulation is requiredwherever they are used. When the switch, N, is in the position shown in thedrawing, the binding posts, n v, being connected by a wire,the…
Physics · Lantern projection · Electric apparatus and appliances
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