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 183
leg ba = 54« 43 1 R ired the reft,~And the other leg bc = 42 12 J n CoNSTRtTCTION. To put either leg on the primitive circle. Having defcribed the primitive circle, and drawnthe right circle ob. Then let the given legs 54* 43, and 420 12,be applied, one from b to a, and the other fromB to c (450);… … Computations.To find the angle A. (522) As Radius To fin. Of leg ab 2= 90 OO == 54 43— 42 \z So cot. other leg bc — To cot. op. angle a — == 48 00 And is acute, as the oppofite leg cb is acute. To find the angle c (522) As Radius rz 900 00 To fin. of leg cb — ~ 42 12So cot. other leg ab — =z 54 43…
Navigation · Nautical astronomy · Fortification
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-86-63.webp)
