Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 622
The thumb, with the end resting against the side of the block, in the manner above represented,allows the blade to move back and forward with a slight degree of pressure against it, and in case of aslip it is ever ready to check the gravers progress. This mode of resting the thumb against the edge… … 1587. £^%1
Mechanical engineering
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