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 49
is three squares which, by the nature of theprocess by which they were made, arc known to be correct.Uses of such squares are shown in Figs. 82-85. OTHER METHODS OF ORIGINATING SQUARES Other methods exist for originating squares, one of which isillustrated in Fig. 20. A square—in this case having… … Fig. 20.—Second method of originating squares. This done, the square is applied to the angle at d when the errorwill be shown at e multiplied by four—three times for therectangular plate and once for the square. The direction of theerror being now known, the square is corrected, as nearly as maybe,…
Machine-shop practice
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