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 271
Now taking 48° 32 from 49° 54, leaves i* 22 = 82 m. $diff. lat. Then in the table it will be found, that the numbers ftanding togther, the neareft to 82 and 54, are 81,95 and 53,73; the diftance afwering to thefe is 98 m. and the courfe is 330 15. By Construction. »ift. Defcribe the quadrant a m c… … 33s To find the Courfe.As diff. lat. = 82 m.To depart. = 54 m.So Rad — 45° oo By Computation. 8,08619 *v323910,00000 To tan. Cou. ■=. 33 22 9,81858 To find the diftance.As fin. Cou. =. 33*22To dep. — 54 m. So Rad =: 900 oo; 0,259 1,732, 10,000: To dift. = 98,18 1,992 By Gunters scale. On the line…
Navigation · Nautical astronomy · Fortification
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