Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 180
s which are subsequently pressedflat. These cards are then assembled, with interposedasbestos, in sufficient numbers to make up the required i68 DYNAMO ELECTRIC MACHINERY. resistance of the rheostat. Iron plates, somewhat widerthan the cards, are introduced at intervals, and thusincrease the… … Fig. 96. is of the bar type, so called because the resistance wireis wound on flat iron bars, but insulated therefrom by alayer of fireproof insulating material. By varying thesize of the wire, resistances may be wound of from .03to 400 ohms per linear inch of the bar, with a maxi-mum capacity of 4…
Electric machinery
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