Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 64
nt given, to detect the pointof contact, hetagbf, {Fig. 89,) be the given ellipsis and tan-gent. Through the centre, e, draw a b, parallel to the tangent;any where between e and/, draw c d, parallel to ab ; bisect cd in0 ; through o and e, drsLW f g ; then g will be the point of con-tact required.… … Fig. 90. d 125.—Any diameter and its conjugate being given, to as-certain the two axes, and thence to describe the ellipsis. Leta b and c d, {Fig. 90,) be the given diameters, conjugate to oneanother. Through c, draw e /, parallel to a b ; from c, draw cg, at right angles to ef; make c g equal to a…
Carpentry · Architecture
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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-390-270.webp)
