Theodolite
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Theodolite
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An optical instrument which consists of a sighting telescope, mounted so
that it is free to rotate around horizontal and vertical axes, and graduated
scales so that the angle of rotation may
be measured. The telescope is usually fitted with a right-angle prism so that
the observer continues to look horizontally into the eyepiece, whatever the
variation of the elevation
angle.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use