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 53
ustrations do not agree in all details because made from differentinstruments. They are, however, identical in all essentials. 42 METHODS OF MACHINE SHOP WORK formation of this impression. In the present use the level usedis of surveying-instrument grade. A shop square in which dependence is place… … Fig. 24.—The spirit level square. ORIGINATING ANGLES OTHER THAN RIGHT ANGLES BY THESCRAPING PROCESS Certain angles other than right angles may be originated bythe scraping process and among these are angles of forty-fivedegrees for which the process is indicated in Fig. 25. Asalways, we begin with…
Machine-shop practice
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