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 123
Furl°nSS- Z-B=:900 OO.Required the rejl. Construction.Make ab=I95 equal parts; draw bc, making an angleat B=r90° oo: From a with 291 equal parts cut bc inc, and draw AC.Then the Z. A meafured on the fcale of chords will be about 48 deg. andZ. c about 42* : Alfo bc on the equal parts, meafures about… … To find the angle cAs ac —291 F.Tos5Z.b=9C° ooSo AEni95 F. 7,53611 10,000002,29003 A.C. To find the lide ec.As ssZ.b=z90° oo 10,00000To AC=r2gt F. 2,46389So s,Z.a=:470 55 9,87050 Tos^c=42° 05 9,82614 To Bc=r2i6F. 2,33439 From 9c0 ooTake 42 05=: Z.c Z.A. [AMPLE V. G Here the fine of 900 oo or radius…
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-271-175.webp)