Haswell's engineers' and mechanics' pocket-book .. (1844)
Haswell, Chas. H. (Charles Haynes), 1809-1907 · New York, Harper & brothers · leaf 60
ine c and d; through c e, d e, draw c ej a.ndde g at pleasure ; dand c are centres for the arcs A g and B/, and e the centre for the arc g oj, whichwill form the arch required. To draw a Gothic Arch—Jig. 16. Rule 1.—Take the length of the line A B, and on the points A and B describe thearcs A c and…
Engineering · Mechanical engineering
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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-65-42.webp)
