International Library of Technology · Scranton, International Textbook Co. · leaf 141
each step as the arm is movedaround. This scheme is used in the rheostat shown inFig. 21, and will be understood by referring to Fig. 22. The regular rheostat con-tacts are arranged asusual and are shown at1, 2, 3, etc. Instead, how-ever, of using a simplecontact arm, the armis provided with… … Multiplyingfiesistance § 20 ELECTRIC RAILWAYS. 53 approximately equal to one of the resistance sections onthe rheostat. By tracing- out the current, it will be seenthat c is placed in parallel with the step on Avhich the armrests, and it has the effect of practically halving the resist-ance of each…
Electrical engineering
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