Bible Dictionaries
Unter's Quadrant
Webster's Dictionary
A thin quadrant, made of brass, wood, etc., showing a stereographic projection on the plane of the equator. By it are found the hour of the day, the sun's azimuth, the altitude of objects in degrees, etc. See Gunter's scale.
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Bibliography Information
Webster, Noah. Entry for 'Unter's Quadrant'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/u/unters-quadrant.html. 1828.