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
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) … Dem. Take ad = radius of the tables.Then de perpendicular to ad, is the tangent ofthe angle A. (299) And the triangles ade, abc, are fimilar.Therefore ab : ad : : bc : de. (250) 342. TRIGONOMETRY. 95 342. PROBLEM III. In any two quantities, their half difference added to their half fum, givesthe…
Navigation · Nautical astronomy · Fortification
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