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 180
drilling a hole when the brace is moved round in the usualdirection, which agrees with the path of a left-hand screw. The cutting motion produces no change inthe length of the instrument, and the screw being held at rest for a moment during the revolution, setsin the cut; but towards the last, the… … The lever-drill, Fig. 550, differs from the latter figure in many respects; it is much stronger, ana ap-plicable to larger holes; the drill-socket is sufficiently long to be cut into the left-hand screw, and thepiece serving as the screwed nut, is a loop terminating in the centre point. The…
Mechanical engineering · Mechanics · Engineering
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