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.

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    uy ani ih tt De tie ne] : beret ip! bf it vi f ial q Py ad i Hal % ij Bt fas Val itt Sh CAL Hee FYE “aatat ht. alba thi | o) ety es Saeed te ane ALL he Wea tet \t ay i i yy tat A) Oe ae i Myid am es ii { (i m,! 4 1k o \ 4 $: Aa r bid « ae } , : ae “| | yT b ’ 4 i; we bd by | ig ae \ ‘ (ale ee . SE ; ee} i i: t)! Lm | { { ‘pe ti , 14 7 4 Li La 118° - Trigonemetrie. ae This lat Table might be propofed in other terms ;.as the firft, Cafe we might exprefle thus Co. ar. sE--s AD +5 A, makes E D, cutting off an unite or 1 inthe firlt place toward the lefthand, which thing being before fufficiently explained, we fhall not here need o infilt thereon. Here J intended to conclude this work::-but becaufe the demon- fration of the firtt fundamental axiome for fpherical triangles, as itis delivered bythe Lord of AderchifFon is very brief, and by him applyed to another kindc of ‘Logarithms, fo that it may feem ob- thap purpole, ahs LEMMA. te In aright op ha [pberical triangle. gleat-the cafe. As.in this Diagratn,, Let AD Brepretent a fpherical Triangles _ right angledat B; fo that A D isthe fine of the hypothenufal, A B - the fine of the bafe,and . D B is the perpendicus Jar. Then is DA B the . angle at the bafe, and LH the fine, and LM . the tangent thercof.Al-_ {oD Fis the fine, and. K-B the tangent of the perpendicular D B. tnd angle there it be and, Is G jpn ABI hy % Gat Paty AB} of th