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 110
-S, 2S°. [J* ::s, 85 : :s, 80 :(s, 2o°-4-s, 140°=) s, 20°4-s ;:s, 75 :(s, i5*4-s, 135°=) s, i5°-fs &c. He. . 4°°- f £ Here the firft and fecond terms in the proportions being equal, the thirdand fourth terms are alio equal. 325. Hence, The fine of an arc greater than 60 degrees, is equal to… … 326. PROP. V. The right fine of an arc being knoiun, to find its ca-fine; and from thefe,to find the tangent, fecant, verfed fine j and alfo the co-tangent, co-fecant*and co-verfed fine. Let ag be any arc, and let ah be its fine, ai itsco-fine; Gf the tangent, be the co-tangent; cf the Bfecant, ce…
Navigation · Nautical astronomy · Fortification
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