Methods of machine shop work : for apprentices and students in technical and trade schools (1914)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York : McGraw-Hill · leaf 47
es surface plates and straight edges maybe originated by the scraping process and among these are 36 METHODS OF MACHINE SHOP WORK right angles or squares. The customary form of shop square isnot satisfactory. The surface of the blade edge is inadequateand the blade is not well secured in the head.… … FiG. 13. Fig. 14.
Machine-shop practice
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