The description and use of the sector, crosse-staffe, and other instruments : with a canon of artificiall Sines and Tangents, and the use thereof in astronomie, navigation, dialling and fortification .. (1636)
Gunter, Edmund, 1581-1626 · London : Printed by William Iones for Iames Bowler · leaf 22
SMS THE FIRST BO ORE OF THE SECTOR. CHAP, t, Tfadefiriftion9 the making, andthegenerall vfe oftheSc&or. … Setior in geometric, is a figure com-prehended of two right lines contain-ing an angle at the center > and of thecircumference aflumed by them. ThisCjeomttric all instrument hauing two legscontaining all variety of angles, and thed rtance of the feete, reprefenting the fubtenfes of the…
Astronomy · Puritans
Internet Archive · Princeton University Library · Public Domain Mark 1.0. Free to use for anything.