Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 269
at circles at any rec^uired inclination to SOLID GEOMETRY a sphere, we shall have little difficulty in projecting sphericaltriangles. SOLUTION OF SPHEEICAL TRIANGLES. The problems in this subject appear rather complicated, onaccount of the number of angles contained in each problem, andthe… … Fig. 55. Cut out the sector of a circle (Fig. 55) of any radius, and then fold it along any two radii00 and OA till the free edges OBand OB coincide. This model isrepresented in Fig. 56. The three sides of the sphericaltriangle are represented by theletters a, h, and c, and the anglesformed by the…
Geometrical 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-359-250.webp)
