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 847
le being established, it may be adapted conveniently to practice by constructing a bevelof brass, of the requisite form, the angle at T being 75-J- degrees : the side T 3 may for convenience begraduated into a scale of quarters of inches as in the Figure; and these divisions may be further… … GEERING. 837 the radius of the wheel in inches upon the reduced scale. Thus in the figure the radius A T is threeinches long, and the point 3 is found at 3 of the scale. To draw the curves of the other teeth, describe from centre A with radius A 3 th<; circle p q, dottedin Fig. 2055, and falling…
Mechanical engineering
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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-237-146.webp)
