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 90
eprefent the plane of the ge-erall meridian as before ; let it be divided into fourcarts, and croffed at right angles with E M the equa-tor, and P S the circle ofthe houre of <5, whereinT ftauds for the North pole, and S for the South pole.Let each quarter ofthe meridian be divided into 90.… … /*v&r ^P, AJE,, may be divided according to the tangentsof halfe their Arkes, that is a tangent of 45 degrees,which isalwayes fooooo equall to the Radilis, {bail give K 3 * 70 of the froiefihn (ftksphre the femidiamicer of 90 degrees a tangent of 40 degfrd83910, mall give 80 degrees, in the…
Astronomy · Puritans
Internet Archive · Princeton University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-34-61.webp)