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 72
165. When the given point a, is without the given circle. Operation, ift. From the centre c draw „> >-..j CA, which bifecl: (146) in B. A1^ 2d. On b, with the radius ba, cut the givencircumference in d. 3d. Thro d, the line ae being drawn will bethe tangent required. This depends on art. 213,… … 166. PROBLEM XV. To two given right lines A, b, to find d a third proportional. Operation, ift. Draw two right lines mak-ing any angle, and meeting in a. -^ 2d. In thefe lines, take ab — firft term, and acy sad each equal to the fecond term. 3d. Draw bd> and thro c draw ce parallel to ct/b d;…
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-329-220.webp)
