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 48
stprovided and here we have an illustration of the fundamentalimportance of straight surfaces for, without them, the originat-ing of the squares would be impossible. As in the case of thesurface plates and straight edges the squares are made in sets ofthree. These are first planed as correctly as… … Fig. 17. Fig. 18. Fig. iq. First method of originating squares. against their being true squares, one of them being slightly overand the other slightly under ninety degrees. When agreementhas been secured, one of the squares, as b/is removed and squarec is substituted for it and scraped to agree…
Machine-shop practice
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
