[Illustration: FIG. 84.] Light. Heavy. Diameter of wheel Inches. 45.2 55.1 Weight " " Lbs. 99 187 Width of tread Inches. 47.2 60.2 Weight of carriage without shield Lbs. 550 990 " " shield " 220 282 Weight of gun, carriage and limber fully equipped " 2112 3487 The trail is formed of two brackets connected by bolts and two transoms, and having a gun-metal rest for carrying the trunnion-saddle, the rear ends being connected by the trail eye-piece, made of cast steel. The brackets diverge at the trunnions, the axle is of steel, and the wheels have metallic naves and tires. The gun-traversing arrangement, giving 4° deflection to the right or left, consists of a cast-steel saddle with trunnion-bearings, and works in the gun-metal rest riveted to the brackets. The elevating and traversing arrangement consists of a steel ball-and-socket elevating-screw working in an oscillating bearing; this bearing, and with it the elevating-screw, can be traversed right and left by means of a small hand-wheel on the left side of the trail, and this causes the trunnion-saddle with the gun to pivot around the centre of the saddle. On the right side of the trail there is a compressing-handle to lock the elevating-screw, so as to make it immovable during firing and whilst travelling. The handspike, of iron tubing, is hinged to the trail. The brake is of the following description: Each axle-arm has a screw cut on its extremity; this carries a nut forming a conical cap, partly enveloping the inner side of the wheel-nave, which is also conical, to fit the inside of the cap; and has a crank-arm by which it can be revolved on the axle. When screwed up, this cap grips the cone of the nave of the wheel until the latter is immovably locked by the friction of the cones. A shield, of three parts, made to fold together, thus forming seats for two men, is sometimes provided. It is of steel plate three sixteenths of an inch thick. The carriage carries the following implements: A sponge on the right bracket, and two handspikes beneath the trail; in the tool-box (which is between the brackets) are carried the feed-trough, hand-crank, rear sight, screw-driver, oil-can, reserve mainspring, reserve firing-pin, hammer, punch, and a universal wrench. THE LIMBER. Light. Heavy. Weight of limber empty Lbs. 605 913 " " " loaded " 1067 1452 Number of rounds in limber 300 300