Arbrier (Fr.). Stock of a cross-bow.
Arc (Fr.). A bow; an arch in building.
Arc à Jalet (Fr.). A small cross-bow, used to throw bullets, etc.
Arc, Elevating. In gunnery, is an arc attached to the base of the breech parallel to the ratchets and graduated into degrees and parts of a degree. A pointer attached to the fulcrum points to the zero of the scale when the axis of the piece is horizontal. Elevations and depressions are indicated by the scale. Besides the graduations on the arc, the ranges (in yards) and the charges for shot and shells are given.
Arch. In military architecture, is a vault or concave building, in form of a curve, erected to support some heavy structure, or passage.
Archers. In military history, a kind of militia or soldiery, armed with bows and arrows. They were much used in former times.
Archery. The use of the bow and arrow; the practice, art, or skill of archers; the art of shooting with a bow and arrow.
Arch-gaye, or Lance-gaye (Fr.). A lance used by the Gauls and Franks, which consisted of a sharp-pointed piece of iron attached to a light wooden handle.
Architonnerre (Fr.). A machine made of copper, which threw iron bullets with great force and noise; it was used in ancient times, being an invention of Archimedes.
Architrave. The master-beam, or chief supporter, in any part of subterraneous fortification.