Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 333
Fig. 379. Trammel Method of Drawing ax Ellipse Instructions: Trammel Method. Fig. 379. Mark off on acard, C D equal to 0 B and C E equal to O A. Keep the trammelwith the point D always on the major axis and point E alwayson the minor axis. Move the trammel and mark points oppositeC to form the… … Fig. 389. Construction Method of Drawing ax Ellipse Second Method. Fig. 380. Draw circles of radii equal to themajor and minor axes. Draw any radii 0 C, 0 D, etc.; drawC G, D H, etc., perpendicular to 0 A, and E G, etc., parallelto 0 A. G, H, etc., are points on the curve. INDEX Accurac}, 133…
Mechanical drawing
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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-215-131.webp)
