Perspective and geometrical drawing : adapted to the use of candidates for second and third-class teachers' certificates (1887)
McGuirl, Thos. H. (Thomas H.) · Toronto, Ont. : W. Briggs · leaf 121
scribe an arc MS, and with centre 0, and same distancedescribe an arc RP; with centre G, and distance equal toMN or OP, describe a circle cutting GD in H. Make arcHK = RP and HL = MS : join GK and GL, and produce themto the circumference in E and F respectively. Draw tangentsat E and F to meet the… … Let KME be the given circle, and divide it (in this case)into six equal parts. Take centre 0, and join any two, as OA,OB ; bisect the angle AOB by OE, and at E draw a tangentCD ; produce OA and OB to meet the tangent in C and D. GEOMETRICAL DRAWING. 119 Bisect the angles at C and D by CF and DF,…
Geometrical drawing · Perspective
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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-151-85.webp)
