Alt i scope

A device which enables a person to see an object in spite of intervening obstacles. In gunnery it is used to point a piece without exposing the person of the gunner. The simplest form consists of a small mirror set in the line of the sights, which reflects the sights and the object aimed at to the eye of the gunner. This form of reflecting sight is used with the Moncrieff counterpoise carriage, and has been recently proposed by Col. Laidley (U. S. Ordnance Corps) for small-arms.