Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • 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.

from the GNU version of the Collaborative International Dictionary of English

  • 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.

from The Century Dictionary and Cyclopedia

  • 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.

Etymologies

From the back + sight (Wiktionary)

Examples

  • 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.

    Sharpe's Havoc

  • Sharpe aimed through the bars of the balcony's balustrade, lining the notch in the rifle's backsight and the leaf of the foresight on Aksel Bang's face.

    Sharpe's Prey

  • Both a foresight and backsight are taken on the point.

    1.1 The role and purpose of irrigation

  • This is a point used primarily to serve as a reference elevation to move the instrument, Both a foresight and backsight are taken on the point.

    Chapter 10

  • Kitchener himself may have placed 'em just so, with D'Israeli's sanction, The Times 'blessing, and the Queen waving 'em good-bye — but now it's their grip on the stock, and their eye at the backsight, and if they break, you're done.

    Flashman and the Dragon

  • Kitchener himself may have placed 'em just so, with D'Israeli's sanction, The Times 'blessing, and the Queen waving 'em good-bye - but now it's their grip on the stock, and their eye at the backsight, and if they break, you're done.

    Flashman And The Dragon

  • Harper raised his first rifle, snapped the backsight into the upright position, and guessed the horsemen were three hundred yards away.

    Sharpe's Eagle

  • It was undoubtedly a very old one, with the open U-shaped backsight which he'd heard of, but never seen.

    The Alamut Ambush

  • Of course, we've got a pretty short back-line to sight on, but the shift is more than a hundred times as great as the possible error in backsight could account for, and there's apparently nothing either regular or systematic about it that I can figure out.

    Skylark Three

  • The tiny figures seen over the slide of the backsight seemed a little larger, but also fewer at each successive volley.

    The River War An Account of the Reconquest of the Sudan

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