Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 39
83.— The same, without making use of the centre of thecircle. Let a, {Fig. 42,) be the given point. From a, set offany distance to 6, and the same from b to c; join a and c ;upon a, with a b for radius, describe the arc, d b e ; make d bequal to be; through a and d, draw a line ; this will be… … a line to the centre d ; bisect a d at e ; upon e, with the radius, e a, describe the arc, afd;fis the point of contact required. If / and d were joined, the line would form right angles withthe tangent, b c. (See Art. 156.)
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-332-223.webp)
