What is the meaning of Backsight?

(n.) The reading of the leveling staff in its unchanged position when the leveling instrument has been taken to a new position; a sight directed backwards to a station previously occupied. Cf. Foresight, n., 3.
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APAWebster's. (2011). backsight. Retrieved September 21, 2026, from http://smartdefine.org/backsight/definitions/1977826
ChicagoWebster's. 2011. "backsight" http://smartdefine.org/backsight/definitions/1977826 (accessed September 21, 2026).
HarvardWebster's 2011, backsight, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/backsight/definitions/1977826>.
MLAWebster's. "backsight" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/backsight/definitions/1977826>