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 109
ing beam caliper made by the SyracuseTwist Drill Company in the act of gaging a rock drill slide valve,Fig. 70 showing the instrument as it actually appears and Fig.71 with a protecting cover removed in order to show the con-struction. The stationary head of the instrument carries amultiplying… … Fig. 70.—With cover plate in position.
Machine-shop practice
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