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 83
the angular point* to the quantise of the Semi-radius^ be defcribed an occult arke that may cut both fidesofthe angle, the chord of this arke mead red in the lateral!chord, (hall give the quantitie ofthe angle. Let the angle given be B-AC.x firft J cake the Semiradiwwith the compafles, and fetting… … Or if the arke be defcrib.d out ofthe angular point at &•ny other difhnce, let.thefemidiameterbe turned into a pa~railall chord of 60 Cjr. then take the chord of this arke, andcarrie it parallell till it croife in like chords .* fo the placewhere it ftayeth (hall give the quantitie ofthe…
Astronomy · Puritans
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