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 115
Then de and fg are the fines of the angles band c. (298) Now the triangles bde, bah, are fimilar, and foare the triangles cfg, cah.Therefore bd : de : : ba : ah. (250) And(cF=)BD : fg : : ca : ah. (25°) But (bdx ah=) dex ba = fgxca. (245) Therefore de : ca : : fg : ba. Or, s,Z_b : ac : : s,Z_c :… … 34^ PROBLEM II. In a right angled plane triangle (abc) if the two fides containing theright angle (b) are known, to find the reft. Then, As one of the known fdesy (a b) To the radius of the tables (or tangent 0/4.$°). (ad) So is the other known fide, (b c) To the tangent of its oppofite angle. (d e)
Navigation · Nautical astronomy · Fortification
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
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