Gunnery. An implement for testing the condition of the bore of a cannon; = gun-searcher n. Now historical.

A device that relieves or eases the strain on something. An iron ring having a long wooden handle at right angles to it, enabling it to be inserted…

Applied to various other instruments for measuring (a) the angle of elevation of a rifle; (b) the roll of a ship at sea; also (c) ‘a carpenter's…

An apparatus for recording the pressure exerted on a gun by a charge of powder; also attributive as in crusher-gauge, crusher-plug.

In ballistics: any of various devices consisting of a thin upright panel through which a projectile is fired in order to measure one or more of its…