BACKSIGHT

Etymology

Noun

backsight (plural backsights)

The rear sight of a firearm.

(surveying) A measurement or reading taken back towards a point of known elevation, used to calculate the height of the surveying instrument (theodolite, transit, total station).

(surveying) A measurement of a previously shot point, used to set the angle to zero when occupying a new position.

Verb

backsight (third-person singular simple present backsights, present participle backsighting, simple past and past participle backsighted)

(surveying) To shoot a backsight.

Source: Wiktionary


Back"sight`, n. Etym: [Back, adv. + sight. ] (Surv.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition



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