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 209
On the upper end of the boring-bar shown at a, Fig. 2552, is placed the geer by which the proper moHtion is given to the feeding-screws. On the end of each feeding-screw is placed a small pinion, wliicbaeers into the inner teeth of a wheel which is loose on the top of boring-bar, and of course does… … with it. This wheel has teeth on the inner and outer sides of its periphery; the outer teeth gcer intoone of a set of two wheels whicli turn together, and are placed on a tixed pivot., independent of theboring-bar. The upper wheel of this set geers into the upper wheel a, which is keyed to the…
Mechanical engineering · Mechanics · Engineering
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