Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 109
^~^pi \W … Various Methods of Constrncting Pigtails for CarbonBruslies the current collected by the brush to the ter-minal on the brush holder. This preventsabrasion of the surface in which the carbonis free to slide, otherwise abrasion is liableto occur by the passage of current and con-sequent sparking…
Electrical engineering
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