Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 614
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 a6lip it is ever ready to check the gravers progress. This mode of resting the thumb against the edge… … of the block is, however, only applicable when the cuts are so small as to allow of the graver, whenthus guided and controlled, to reach every part of the subject. When the cut is too large to admit oithis, the thumb then rests upon the surface of the block, as seen in Fig. 15S6; still forming a…
Mechanical engineering · Mechanics · Engineering
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