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 fortification. And some questions in navigation added by Mr. Henry Bond, teacher of mathematicks in Ratcliff, near London. To which is added, the description and use of another sector and quadrant, both of them invented by Mr. Sam. Foster, late professor of astronomy in Gresham Colledge, London, 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.[larke]. for Francis Eglesfield, at the Marigold in St. Paul's Church-yard · leaf 317
berefh As in the fame fccond Example, the Sines of 78^. and of 98 gr . 30m. being the Numbers to be fubtra&ed ; if I take 9990, ^o44the Sineof 78 gr. out of the Radius 10000, 0000, the rdidueis 9. 595 6 : and (o the rdidue of P794> *4 95 i$.205* 8505, Wherefore inftead of fubtra&ingthefe Sines, I… … Azimuth. If we find the $uns Azimuth as fceforc, to be 72 gr, 5* »• fro0* North to the - Wcflwirdj 'V
