Gunner's quadrant

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an instrument consisting of a graduated limb, with a plumb line or spirit level, and an arm by which it is applied to a cannon or mortar in adjusting it to the elevation required for attaining the desired range.

See also: Quadrant

References in periodicals archive ?
With classic examples like the stirrup and lesser known innovations like the gunner's quadrant, the series reveals how even the smallest innovations can have a wide-ranging effect on the way wars are fought.
A new gunner's quadrant lighting kits is available that makes the M1A1 quadrant readable at night.