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 520
4 HAWKINS ELECTRICITY Foot power polishing wheels are made in a great variety of form,and are chiefly used in small jewelers establishments for buffing watchcases, rings and other small articles. Polishing Wheels.—These are made of canvas, wood, felt,leather, and walrus hide. Rough heavy castings… … Fig. 4,592.—Hanson and Van Winkle polishing and grinding machine with electric motordrive. The magnetic frame is made of a combination of cast iron and cast steel, havingmany ribs around the top, back, and bottom to assist in keeping the motor cool under allconditions of load, and enabling it to…
Electrical engineering
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