The works of Edmund Gunter : containing the description and use of the sector, cross-staff, bow, quadrant, and other instruments : with a canon of artificial sines and tangents to a radius of 10.00000 parts, and the logarithms from an unite to 10000 : the uses whereof are illustrated in the practice of arithmetick, geometry, astronomy, navigation, dialling, and fortifcation : and some questions in navigation added by Mr. Henry Bond ... : to which is added, the description and use of another sector and quadrant, both of them invented by Mr. Sam. Foster ..., furnished with more lines, and differing from those of Mr. Gunters both in form and manner of working. -- (1673)
Gunter, Edmund, 1581-1626 · London : Printed by A.C. for Francis Eglesfield ... · leaf 406
| es renee | qe 58 The Deferiptios of the Tropicks | the Angle at che Pole between che Subftylar and the Hour-line, whereon | you mean to defcribe the Parallel. “ | Jf you would find where the Parallels do erofs the Subftylar, … ‘Asin the Example of che Polar Plane, where che length of che Style | BC was found to be r Inch 61 cent, If you defire to know the diftance. between the Equinoétial and the Tropick upon the Subftylar Line, ex- rend the Compaffes from the Tangent of 45 gr. unto the Tangent of 23.gr. 30m. the fame…
Mathematical instruments · Logarithms · Sundials · Navigation -- Early works to 1800
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
