Fairbairn, William, Sir, 1789-1874 · London, Longman, Green, Longman, Roberts & Green · leaf 47
n tangent passes in all positions of thewheel and pinion through c, which is the sufficient condition oftheir uniform motion, if moved by the sliding of the curvesinstead of by contact at c. Hence, if the wheels be constructedwith teeth formed to these involute curves, they will work withperfect… … WHEELS AND PULLIES. 27 making an angle with A b, not deviating more than 20° froma right angle. Involute wheels have the double advantagethat they work equally well if, through the wear of the brasses,the wheels have receded from one another; and any involutewheels of the same pitch and similarly…
Mills and mill-work · Machinery
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![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-400-277.webp)
