International Library of Technology · Scranton, International Textbook Co. · leaf 26
copper plated to within \ inch or \ inch of their bearingends, in order to give them better contact with the brushholders. Also, carbon brushes often contain a lubricant inthe form of the paraffin with which the carbon dust is treatedin the course of its manufacture, so that these brushes… … (a) (h) Fig. 5. carbon radial brushes are aU I- 12 OPERATION OF § 10 13. Carbon brushes are made in several grades of hard-ness, adapted to different conditions of working and differentkinds of commutators. In stationary, direct-current work,soft carbon is used; on street-car work, hard…
Electrical engineering
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