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.

    109/220 (page 93)
    — : “The (econd Book. 93 js 00) leaving out Rad. orthe Git unite in the fume, and fo the work is as followeth : ipa @ a sGH 38 deg. 28! 97938317) Secondly , for the bafe BH, — gH 56 26 9-9207717 fay sc H-f-Rad==teG H-+- ‘sGB 31 13 329-7146034 3 BH, and {fo the operagion ftands thus as beneath» | ¢ GH38 28 99090065 . The fumme or remainer of BH .gcH 56 26 -9-7420520 and F H is F B. -t BH 230-43 9.64273%5 Buthere from F H 74 deg. so | fubftraéting BH 23 43 » there remains FB 51 07 Thirdly, for the fide required FG, having G B and F B. Say | ge Ge Rad==seG B-b-se FB, and fo the operation ftands thus. %. GB 31 deg.13’ GB 9.9320746 FB 5! 07 soF B 9:1977715. EG57 32. 46FG 9.779852! Which 57, 32218 the fide FG required. , Andas inthis-firlt Example the perpendicular was lec fall fromthe HH : -angleat G, foit might in this Cafe have been let fall from the angle We | in the fecond Triangle, and.in this fecond Example. at F, ast Date FH 744+ 50’5H 56.4.26',G H 38 28, required FG. ine i Pirkt, for the perpend.F Blay, + F B4-Rad==s F H-++s H. a a ‘Secondly, for the bafe, BH fay, tc H-+-Rad=tc FP H+: BH, a) ea] AndB H—G H=BG. ~ haa! ie TBirdly,for the fide required FG fay, sc FG+4-Rad==sc FB-4-sc BG: i The operations are’as followeth. ‘eae | LEH 744.50'sFH 9.9846033 UFI774 59¢F H 105669196 eee 56265 H 9.9207717_ — Hs 6 26 se H -'9-7425520 ly a pl ae lt B: F B 53 325 FB 9.9053759 B H63 53tBH 103097516 nF : BG 25-25 ‘ LLLP Bygidege3? 6 FB. .9:7740459 gp BG 25 5, 25 $)BF..9-9557299 FG 57 32 sc FG 9.72983 49 AWhich 37 32 48 the fide required before, -