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 181
aterial. 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 watts per square inch of surface onone side. Field rheostats for very large generators consist of re-sistance units in the form of iron grids supported… … Fig. 97. Another form of field rheostat, made by the Cutler-Hammer Manufacturing Company, is shown in Fig. 98.In this rheostat the heat generated is not radiated directlyfrom the surface of the wire, but is conducted to a sup-porting plate, which then becomes the radiating surface.The resistance…
Electric machinery
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