The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)
Robertson, J. (John), 1712-1776, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John, 1735-1826, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 68
us, greater than halfA B, defcribe arcs cutting in c and d. 3d. A ruler laid by c and d, gives E, themiddle of A b, as required. The proof of this operation depends on articles191, 189. ■Co A E )(D s. 147. PROBLEM II. To bifecl a given right lined angle a b c. Operation, ift.FromB, defcribe an arc… … 148. PROBLEM. III. From a given point B, in a given right line A F, to draw a right line per-pendicular to the given line* When b is near the middle of the line Operation, ift. On each fide of b, takethe equal diftances b c, and b e. 2d. On c and e defcribe, with one radius4arcs cutting in D. 3d. A…
Navigation · Nautical astronomy · Fortification
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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)
