Sight, Coarse. An aim of a piece in which a considerable portion of the front-sight covers the object.
Sight, Elevating. The rear-sight of a small-arm, arranged to give varying heights of sight for different ranges. There are a variety of forms. The [leaf-sight] has a number of hinged leaves of different lengths. The one now used in the U. S. army has one hinged leaf. Up to 500 yards, the elevation is given by moving the sighting-piece up a curved incline. Above 500 yards, the leaf is turned up to the perpendicular.
Sight, Fine. An aim in which only the summit of the front-sight is used to get the line of sight.
Sight, Front-. The sight nearest the muzzle of a cannon or small-arm. In military arms, it is set on a short projection which is used also as the bayonet-stud. In cannon of old model, using the [tangent scale], or pendulum hausse, the height of the front-sight is made equal to the dispart, making the [natural line of sight] parallel to the axis of the piece. See [Dispart].
Sight, Line of. See [Pointing].
Sight, Peep-. A form of rear-sight for small-arms in which the marksman looks through a small hole.
Sight, Plane of. See [Pointing].
Sight, Quarter-. The quarter-sights of a cannon are divisions marked on the upper quarters of the base-ring, commencing where it would be intersected by a plane parallel to the axis of the piece, and tangent to the upper surface of the trunnions; used for giving elevations up to three degrees, and especially for pointing at a less elevation than the natural angle of sight. Now obsolete.
Sight, Rear-. The sight nearest the breech of a cannon or small-arm. The term is specially applied to small-arms.
Sight, Telescopic. An apparatus for sighting a cannon or small-arm, consisting of a telescope so mounted as to give varying angles of sight; used especially for long ranges. Rifles with such an attachment are sometimes called telescopic rifles.