Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 494
ries the armature is jour-naled at the lower end in the middle of a U-magnet and atthe upper end in a brass cross piece attached to the poles ofthe magnet. The armature consists of a cross arm of softiron wound with four or five layers of fine wire. The ter-minals of the winding of the armature are… … one of the commutator springs, and is provided with aninsulating covering on its sides, while its upper end is bare.Upon the stud is placed an annular cell of carbon, which istouched on its outer surface by a spring connected with theremaining commutator spring. The cell forms one of theelements of…
Physics · Lantern projection · Electric apparatus and appliances
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