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The elements of navigation; containing the theory and practice. With the necessary tables, and compendiums for finding the latitude and longitude at sea. To which is added, a treatise of marine fortification. Composed for the use of the Royal Mathematical School at Christ's Hospital, the Royal Academy at Portsmouth, and the gentlemen of the Navy .. (1786)

Robertson, J. (John), 1712-1776, Wales, William, 1734?-1798, Wilson, James, M.D., of London · London : C. Nourse · leaf 232

An illustration from The elements of navigation; containing the theory and practice. With the necessary tables, and compendiums for finding the latitude and longitude at sea. To which is added, a treatise of marine fortification. Composed for the use of the Royal Mathematical School at Christ's Hospital, the Royal Academy at Portsmouth, and the gentlemen of the Navy .., 1786, leaf 232
ab, the other givenfide from b,= ii4° 30, (68) Then ABC is the triangle fought. And the parts required are meafured by art. 70, 72. Computation.To find the angle A, oppofite to the other given fide. (144)A; fin. one fide Asr: 114 30 0,04098 ) 1 o Im. op. Z. cm25 209,911581 Which may be either acute… … As Rad To tan. giv. /. c=:i25 20 10,14941 Soco-f.adj fid.Bc;= 56 40 9j73y97 — n,°co 10,00000 Asco-t.S.ad.g./.ucr: 564oo,i8i97Toco-t.oth.fideABz:;! 14. 30 9,65870So co-f. m =127 47 9,7^723 To co-t. m r=i27 47 9,88938 And is obtufe, as the given angleand its given adjacent fide are unlike. To co-f. n…

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