inner and outer tube. The inner tube has a shoe, and the rear end of the outer tube has a bracket for the saddle and a handle to clamp the inner to the outer tube.
The Mark IV. tripod weighs 48 lb., and the mounting consists of a crosshead, elevating gear, and socket mounted on three legs. It has 13 degrees elevation and 25 degrees depression, but by arranging the position of legs 43 degrees and 55 degrees can be had. It has an all-round traverse. The elevating gear is actuated by a hand-wheel, which consists of an inner and an outer screen. The legs are of tubular steel, the lower ends being fitted with shoes to steady the mountings, and the upper ends have a joint with serrations; the rear leg has a joint pin with nut and jamming handle. Joint studs with disc springs and jamming handles are fixed to the front legs, by which the legs are securely clamped in the required position. Numbers are stamped on the legs to show the relative position of the legs to their normal position. The legs are secured by a leather strap for transport. When firing, the ammunition box is placed on the ground on the right side of the gun. The gun can be fired at heights varying from 14-1/2 inches to 30 inches above the ground.
Tactical.—Directions for the use of machine guns are found in the various textbooks issued for each arm. Training is dealt with in the Handbook for ·303 Machine Guns, 1907, and
