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 118
RRORS 107 errors are as apt to lie in one direction as the other. The dialmay be turned to bring the zero under the index wherever itmay happen to lie at the iirst reading. This adjustment,combined with the increased range of the instrument, makesit more convenient for many purposes than the lever… … Fig. 86.—Testing the parallelism of a radial drilling machine arm and base andthe squareness of the spindle with the base. vertically, it is obvious that the degree of squareness of theplaner housings with the Vs of the bed in both directions isquickly determined. Similarly Figs. 84 and 85, from…
Machine-shop practice
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