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 89
mall,62 per cent, too large and 13 per cent, correct. In both cases the direction of thelargest error was the same as that of the greatest number of errors. ^ Gages of this form and for this purpose were first made by John Richards. 78 METHODS OF MACHINE SHOP WORK The degree of accuracy to be… … Fig. 51.—Standard reference discs. differ in diameter by a ten thousandth of an inch and betweenthem is a snap gage. Trying this gage upon the plugs, the handof any one, no matter how unskilled, will detect, without
Machine-shop practice
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