Freehand perspective and sketching; principles and methods of expression in the pictorial representation of common objects, interiors, buildings and landscapes (1910)
Norton, Dora Miriam · Brooklyn : D. M. Norton · leaf 82
/EYEFig. 102 ACTUAL CENTER OF CIRCLE, ETC. … Geometric diagram. diameter of the circle touches the square in c and d^ the ellipse appears longest at a part nearer than c and d, which seems to be exactly half way between e and /. Through this half-way point {x) the long diameter can be drawn; making it longer than c-d^ and yet not quite…
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-214-129.webp)
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-445-176.webp)
