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 315
i2o To find the declination of a Plane. To find the inclination of any Plane, For the/diftinguiming of thefc Planes we may finde whe=ther they be horizontal!, orvercicall, or inclining to the ho-rizon, and how much they incline, either by the vfuall incii-natorie quadrant, or by fitting a thread… … parallel! to the edges of one of the legs, fo that leg fhall bevertical!, and the other leg parallell to the horizon. If Tefndtht inclination of a Plant. 121 If the plane fa nr to ce vertical 1 f like the wall of an vjvright building)) <su may trie it by holding the Setter t Co thatthetrrtadnay…
Astronomy · Puritans
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