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 181
-bench. All the before-mentioned tools are commonly found in a variety of shapes in the hands of the engineer,but it will be observed they are all driven by hand-power, and are carried to the work. I shall concludethis section with the description of a more recent drill-tool of the same kind. This… … cut by a differential motion. The tangent-screw moves at the same time tiie two worm-wheels a and b;the former has fifteen teeth, and serves to revolve the drill; the latter has 16 teeth, and by thedifference between the two, or the odd tooth, advances the chill slowly and continually, which may…
Mechanical engineering · Mechanics · Engineering
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