CARE AND PRESERVATION. The gun requires no special care beyond that of being kept clean, free from rust and undefaced. _Brick-dust or gritty substances must never be used on any part of the gun._ _The parts of the mechanism must never be scraped with knives or metal, or be defaced or roughened in any way._ _All parts of the gun must be kept lightly oiled as a protection from rust._ After firing, the gun should invariably be thoroughly cleaned. To do this, dismount the mechanism completely and wash every part thoroughly with warm fresh-water soapsuds; mechanism, breech-block, mortise, and barrel should all be treated alike. After thoroughly scrubbing all parts, dry them carefully and let all stand for a short time to air and dry off the moisture. After drying, rub all parts over with a well-oiled rag. Mount the mechanism. On the march the breech and muzzle should always be protected by the covers supplied for the purpose. When parked, guns and carriages should be covered with paulins. SIGHTS. The =Front Sight= is a plain roughened steel point-sight, and is permanently fixed to the right rim-base. [Illustration: FIG. 4.] The =Bar Tangent Sight= (Fig. 4) is a plain vertical bar-sight carrying a sliding leaf conveniently graduated. Both the bar and the leaf have clamp-screws to fix them in position. The tangent sight is only mounted on the gun when in action, being at other times removed to avoid injuring it. The bar is graduated to 15°, each being subdivided into six parts. It may be graduated in yards or metres. It is compensated for natural drift. A vernier-mark on the head of the sight and graduations on the sliding leaf correct ordinary deviations. The =Gunner's Quadrant=, for mountain-guns, is a small pocket-quadrant with a spirit-level limb pivoted. On the arc are inscribed both the degrees of elevation and ranges corresponding to the gun for which it is used. It is thoroughly reliable both for direct and curved fire, and to a very great extent supplants the sight-bar. The recoil is checked by rope-brakes, hooked to the trail-handles and passed around the felloes of the wheels. No limber is used, but a pole which is readily attached to the trail is provided for hauling the carriage. AMMUNITION. The ammunition is fixed, and consists of common shell and canister. Weight of round (common shell) 2.62 pounds Weight of shell, filled 1.95 " Weight of round (canister) complete 3.47 " Weight of canister 2.8 " Number of balls in canister 30 Powder-charge 5½ oz. mortar Bursting-charge of shell 1.8 oz. Weight of cartridge case empty 5.3 " Weight of fuze 1.9 "