Trigonometrie. Or, the doctrine of triangles: divided into two books. The first shewing the mensuration of right lined triangles: the second of spherical ... Both performed by that late and excellent invention of logarithms ... Whereunto is annexed (chiefly for the use of sea-men) a treatise of the application thereof in the three principal kinds of sailing. With exact tables of the suns declination ... and tables of the right ascension and declination of some eminent fixed stars ... Also other necessary tables used in navigation / [Richard Norwood].

  • Richard Norwood
Date:
1661
Catalogue details

Licence: Public Domain Mark

Credit: Trigonometrie. Or, the doctrine of triangles: divided into two books. The first shewing the mensuration of right lined triangles: the second of spherical ... Both performed by that late and excellent invention of logarithms ... Whereunto is annexed (chiefly for the use of sea-men) a treatise of the application thereof in the three principal kinds of sailing. With exact tables of the suns declination ... and tables of the right ascension and declination of some eminent fixed stars ... Also other necessary tables used in navigation / [Richard Norwood]. Source: Wellcome Collection.

    116/220 (page 100)
    \ The operations,, ; InsP. G57d,32' 9.9261901 Il.t. 5 G72 24 9:9793798_ SEBs3 32 99053699 sBF H68. 219 9.9686061. —BFG30 35 GF 37. 54, the angle at F requireds. Se & ry, - €¢ ly] uo ace Ie Cale 10. Two angles aud a fide oppifite to one of them gi-. ven: t0 find the fide between them. ‘Flere the perpendicular muft fall from P, as in the fecond Triangle,. Firft, for the perpend, F B, fay,s FB -+- Rad =s FG-+sG. Secondly, for the bafe B @s, fay, seG-+ Rad—=tcFG+2BG.. Thirdly, for the bafe BH; fay,s B H-{- Rad==tF Bic H. The fumme or remainer.of B G and BHis GH. The operations. . : Iss FG57-d. 32’ 9.9261901. II. tFG 54d. 32/ 10.1962704 5. GqJr 24. 9:9791798 sco. G72 24 9.4805385° $FBS53. 32 9.9053699 tBG25, 25 9,6769939 Tlie F B53 d. 32’ 101313196. tc Hy56 26° °9.8218803 - sBH63. 53. 99532999. —BG 25; 5: ; ( GAT38. 28; the fide requireds. iS] 7