Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 509
thus easilyand cheaply cleaned without much manual labor, which is theexpensive item in polishing. If rough castings are being worked,the sand, scale, etc., adhering to them is allowed to remain inthe barrel, where it acts as a polishing powder, brightening theparts which are not reached by the… … FlG- 4.572—Hanson and Van Wlnkle tumbling barrel with convex head for dry tumbling.1 he type of barrel is especially adapted for removing burrs and for smoothing smallcastings. This barrel gives three distinct motions to the articles: rolling, shaking, and snrfaninc. spreading. rubbing against…
Electrical engineering
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