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 836
plane cf the other wheel with the pitch circle of that wheel as its base, and if the actingsurfaces of the teeth on the two wheels be cut so as to coincide with these curves, they will be drivenby the intervention of these teeth in the same manner as they would by simple contact of their… … 826 GEERING. this property, tliat a lino drawn from any point of their contact to the point of contact of the pitchcircles is a normal to both, which, as already shown, is the one necessary and sufficient condition.Further, it can be shown that a tooth of any form whatever being cut upon a wheel,…
Mechanical engineering
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-150-84.webp)
