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 517
e 4j/£ is hard and adapted togrinding heavy iron castings and edge work on iron and steel. Nos. 16 to 20. Grade 5 isvery hard. This wheel is made especially for plow jointing and very hard steel edge grinding;will not do surface work. Nos. 16 to 20. Grade 6 is made of the finer grades of emery,to… … Fig. 4,580.—Hanson and Van Winkle universal polishing wheel, for all polishing operationsthat require felt, canvas, or bullneck wheel. When used for roughing: A mediumsoft wheel should be used for brass, steel or malleable iron. The wheel may be a triflehard when new, but will soften up after a few…
Electrical engineering
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