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 51
Figs. 22 and 2$.—Fourth method of originating squares. PRECISION WORK AND WORKMANSHIP 41 ing shop squares by the test square. Placed in position asshown, small pieces of paper are placed between the cylinderand the blade of the shop square and, if the pieces of paperare all pinched alike, the truth…
Machine-shop practice
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