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
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;… … 167. PROBLEM. Xtl. To three given right lines a, b, c, to find d a fourth proportional. Operation, ift. Draw two right lines mak- A- - ing any angle, and meeting in a. 2d. In thefe lines take a b — firft term, a c ■=. fe-cond term, and ad = third term. 3d. Draw b c, and parallel thereto thro d…
Navigation · Nautical astronomy · Fortification
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