International Library of Technology · Scranton, International Textbook Co. · leaf 463
achines are built with only one brush for eachcollector ring. Two or more brushes should, however, be used for each termi-nal of the rectifier,because these brush-es are liable to needmore or less adjust-ment while the ma-chine is running.The holders usedshould be so designedthat the copper… … Fig. 1649. CURRENT APPARATUS. 2829 the brushes may be lifted from the commutator and heldoff, and the pressure of the brush on the ring should beeasily varied. The pressure of the brush on the ring maybe provided by making the brush itself act as a spring, orthe holder may be provided with a…
Electrical engineering
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