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 93
HINE SHOP WORK Bond informs the author that his practice is to match theedge of the cross hair against the edge of the Hne. THE HISTORY OF MEASURING MACHINES To the best of the authors knowledge the history of the shopmicrometer begins with one made by James Watt, now in theSouth Kensington Museum… … Fig. 56.—James Watts micrometer caliper. While this instrument shows clearly enough the conceptionof accuracy and a method of obtaining it, it is not to be imaginedthat its real was equal to its nominal accuracy. It was notpossible in Watts time to make screws sufficiently accuratefor such a…
Machine-shop practice
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