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 181
To put the given leg on the primitive circle. Draw the right circle oab, and another oe atright angles. Make bc equal to the given leg 420 12; drawthe diameter cd, and another op at right angles. About E, the pole of ab, defcribe a fmallcircle (456), at the diftanee of the given angle48 00, cutting… … To find the hypothenufe. (516) As fin. giv. Z_ *= 4$° oo 0,12893 To fm.giv. leg — 42 12 9,82719 So Rad . =90 00 10,00000 To fin. hyp. 64 40I 9,95612 And is either acute or obtufe. To find the other leg.As Rad = 900 oo To cot. giv. z. =^ 48 00Sotan.giv.leg = 42 12 To fin. req. leg = 54 44 (5) 10,00…
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-266-171.webp)
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