Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments, elementary instruction in practical mechanical drawing together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1883)
ius, an equal number ofpoints of division, as i, 2, 3, 4, 5. With the pom-passes set to the radius of the generating circle, thatis, A B, from B, as a centre, mark the arc I, from D,the arc J, from E, the arc K, from F, and so on, mark-ing as many arcs as there are points of division on BC. With… … Fig. 239. points of division, as a, b, c, d; and ^ will be anotherpoint on the epicycloidal curve. From point 3, setoff three divisions, and so on, and through the pointsso obtained draw by hand, or with a scroll, the curve.Hypocycloids for the Hanks of the teeth maybe tracedin a similar manner.…
Mechanical drawing
Internet Archive · Library of Congress · 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-161-90.webp)
