International Library of Technology · Scranton, International Textbook Co. · leaf 284
parking and do not cutthe commutator, as copper brushes are apt to do, unlessthey are very carefully looked after. Most incandescentdynamos have bar-wound armatures, i. e., the conductorson the armatures are in the shape of copper bars rather thanwires, because a large cross-section of conductor is… … §16 ELECTRIC LIGHTING. 87 at a speed of 275 revolutions per minute. The speed of thelarger sizes of direct-connected machine is correspondinglylower, and in case they are direct connected to large, slow-speed Corliss engines, the speed is usually from 75 to100 revolutions per minute.…
Electrical engineering
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