Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 115
. The accuracy of working squares may be tested, in theabsence of a standard square, in the following manner (Fig. 41): First test the edgesof the stock to findif they are parallel,and also the edgesof the blade. Ob-tain a flat surfacewith a perfectlystraight edge, and apply the stock of the square… … Fig. 40 Position 2 -f C Position 1 Flat Surface Fig. 41. If the edge does not coincide, the square is out of truth to the ex-tent of half the angle the reversed square makes with the originalline. After the first equipment of the centre, any replacementsof this tool will form a good exercise for…
Metal-work
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