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 269
foundibottom. Now taking 470 20 from 480 42 leaves i° 22 = 82 m. tidiff. lat. Then feeking till againft dift. 98, ftands lat. 82, the neareft willlat. 81,95, and here the departure is 53,73 m. and the courfe is 33° r By Construction. 1 ft. Defcribe the quadrant A ?n c p. 2d. Continue a m, till ad =… … To find the courfe. As dift.To RadSo diff. lat. := 98 m. 8,00877 — 900 oo 10,00000=3 82 m. 1,91381 To cof. Co. = 33*47 9,92258 Tp find the departure. As Rad rr 900 co 10,000 To dift. = 98 m. 1,991 So fin. Co. = 330 137 9,738 To dep. = 53»69 *>!*$ By Gunters scale. On the line of numbers, the…
Navigation · Nautical astronomy · Fortification
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