Gunner. A soldier employed to manage and discharge great guns; an artilleryman. In the U. S. service there is with each piece a gunner, who gives all the executive commands in action. He is answerable that the men at the piece perform their duties correctly.
Gunner’s Calipers. Are made of sheet-brass, with steel points. The graduations show diameters of guns, shot, etc.
Gunner’s Elevating Arc. See [Elevating Arc].
Gunner’s Level, or Gunner’s Perpendicular. Is an instrument made of sheet-brass; the lower part is cut in the form of a crescent, the points of which are made of steel; a small spirit-level is fastened to one side of the plate, parallel to the line joining the points of the crescent, and a slider is fastened to the same side of the plate, perpendicular to the axis of the piece. This instrument is used to mark the points of sight on pieces. By means of the bubble the feet or points of the crescent are placed on a horizontal line on the base-ring or base-line, the slider pushed down until the point rests on the base-ring or line, and its position marked with chalk.
Gunner’s Pincers. Are made of iron with steel jaws, which have on the end of one a claw for drawing nails, etc.
Gunner’s Plummet. A simple line and bob for pointing mortars.
Gunner’s Quadrant. Is a graduated quarter of a circle of sheet-brass of 6 inches radius, attached to a brass rule 22 inches long. It has an arm carrying a spirit-level at its middle and a vernier at its movable end. To get a required elevation, the vernier is fixed at the indicated degree, the brass rule is then inserted in the bore parallel to the axis of the piece; the gun is then elevated or depressed until the level is horizontal. There is also a graduated quadrant of wood, of 6 inches radius, attached to a rule 23.5 inches long. It has a plumb-line and bob, which are carried, when not in use, in a hole in the end of the rule, covered by a brass plate.
Gunnery. The art of using fire-arms; but the term is commonly understood as being restricted to the use or application to the purposes of war of the larger pieces of ordnance, as cannon, mortars, and howitzers. In its practical branch gunnery includes a just knowledge of the construction of the several pieces of artillery, and of the strength, tenacity, and resisting power of the materials of which they are formed; of the method of mounting them upon strong, efficient, well-proportioned, and conveniently constructed carriages; of the proportions due to the strength of the powder and projectiles they should carry; of the force and effect, and also of the manufacture of gunpowder; and, generally, of all such mechanical arrangements and appliances as may facilitate the movements and working of the guns, etc., when prepared for action. But gunnery takes a yet far more extensive range; for it may be said to be based upon nearly every branch of the mathematical and physical sciences, and may be itself considered as a science requiring the most intricate combinations of human knowledge and mechanical ingenuity fully to comprehend and perfect. It particularly requires an acquaintance with all experiments which may have been made to ascertain the impetus of projection, the momentum of bodies in motion, and the range and time of flight of projectiles with given charges of gunpowder,—with the effect of the resistance of the atmosphere upon projectiles propelled with different velocities, and the laws of gravitation as affecting falling bodies; and with the various causes, mechanical and otherwise, of the usual deflection of projectiles in their course, when fired from a gun. See [Projectiles] and [Velocity].
Gunning. The act of hunting or shooting game with a gun.
Gun-pendulum. A contrivance for obtaining initial velocities of projectiles. The gun is suspended from a frame-work with its axis horizontal. The velocity of the shot is deduced from the arc described in the recoil. The apparatus is now nearly obsolete.