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 621
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…
Mechanical engineering
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