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n. The rear sight of a firearm.

n. A measurement or reading taken back towards a point of known elevation, used to calculate the height of the theodolite.

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

v. To shoot a 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.

n. In surveying, the reading of a leveling-rod, taken when looking back to a station which has been passed. All other readings are called foresights.

n. The rear sight of a gun.

"The swan-neck cock made a slight creaking noise as it compressed the mainspring, then there was a click as the pawl took the strain and Hagman hinged the backsight up as high as it would go, then lined its notch with the blade-sight dovetailed at the muzzle."

foresight    hindsight   

foresight   

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