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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 187

An illustration from 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, leaf 187
for the houres of 9 and 5and che tangc t of 6ogr. for the houres ol 8 and 4^ and :hetangent of ysgr. for the houres of 7 and $♦ Or if anv pleafe to fet downe the. parts of an houre, he mayallowjgr,30 w.for every h4fe houre,and 3^»4> ^»for cv?~~ry quanxr. This done, you are to confider the… … The ufi of the lejfer Tangent, g j $ for example, about London the latitude is ?i £>-, 30 m,md Let the plane be verticall. If you take A V the (ecant of;igr* 30 *». out of the Sector, and pricke.it dow.vc in fche me—idian line from A unto f, the point V fliall be^he center:md if you draw right…

Astronomy · Puritans

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