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 183
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 sectiou with the description of a more recent drill-tool of the same kind. This instrument is… … cut by a differential motion. The tangent^screw moves at the same time the 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 drill slowly and continually, which may…
Mechanical engineering
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