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 189
e houres of a and 10; and thetangent of 75-f. for the houres of 1 and 11. And if you drawlight line; through thefe houre points, jcrolHng the aequa-or at right angles, chey fhali bs the houre lines required. The • v6o The ufc of tic lejfer tdtgttitl The fubftilar will be the fame with the ho ure of… … The yfc of the hffer iMgtni* I to 5 To drAW the houre lines in a vertical! dedimngfhnc. Firft, draw -4 Tthe meridian, and A E the horizontal lineCrofling one the other at right angles in the point A. a Tnentake out^f, the-fecant of the latitude ol theplace, which you may fuppofe to be 51 gr% 30 m»…
Astronomy · Puritans
Internet Archive · Princeton University Library · Public Domain Mark 1.0. Free to use for anything.
