backsight

American  

[bak-sahyt] / ˈbækˌsaɪt /

noun

Surveying.

1. a sight on a previously occupied instrument station.

2. (in leveling) the reading on a rod that is held on a point of known elevation, used in computing the elevation of the instrument.

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backsight British  

/ ˈbækˌsaɪt /

noun

1. the sight of a rifle nearer the stock

2. surveying a reading taken looking backwards to a previously occupied station Compare foresight

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Etymology

Origin of backsight

First recorded in 1840–50; back ² + sight

Example Sentences

To counteract this the aim must be taken higher, but the rifle is so constructed that by raising the slide of the backsight a little, aim may be taken at the original spot.

From Project Gutenberg

An ingenious little instrument called the Vernier is used for measuring the elevation, When it is considered, that, at 600 yards distance from the targets, the difference of 1/150th of an inch on the backsight will be equal to half a foot on the target, it will evidently be of the greatest importance to be able to adjust the sights accordingly.

From Project Gutenberg

These differences in the appearance of the foresight are corrected by raising the backsight in a bright light, and lowering it when dull.

From Project Gutenberg

For this purpose Verniers are made so delicate as to move the backsight through such a small space as the 1/150th of an inch at a time.

From Project Gutenberg

"Now," exclaimed Andy, setting the backsight of his rifle.

From Project Gutenberg