The drawn metallic cartridge-case (Fig. 5) is of brass, and is drawn from the solid metal to shape. It is reinforced at the base by inside (_c_) and outside (_b_) cups of the same metal. The head (_d_) is fastened to the base by brass rivets which clamp the body, cups, and head solidly together. A vent (_v_) is pierced through the head of the cartridge, and five eccentric flash-holes (_a_) through the reinforcing-cups. The jet of flame from the primer, entering the vent, lifts the reinforcing-cups and forces its way through the flash-holes to the charge. The charge being ignited, the pressure of the gas immediately forces back the reinforcing-cups and seals the vent. The charge, consisting of 5½ oz. of black powder, is well shaken down and separated from the base of the projectile by a felt wad. When smokeless powder is employed, an igniter containing about 40 grains (3 grammes) of musket-powder is placed in the bottom of the cartridge-case. The vent is sealed with a thin coating of wax. [Illustration: Fig. 5.] [Illustration: Fig. 6.] [Illustration: Fig. 7.] The =Common Shell= (Fig. 6) is of the cylindro-ogival pattern with a brass band, and is fitted with a base percussion-fuze. It contains a bursting-charge of about 1¾ oz. (950 grammes) of musket-powder. The =Canister= (Fig. 7) consists of a thin envelope of drawn brass, containing thirty hardened 1-oz. lead balls packed in sulphur. On the body is an annular stop to prevent inserting too far into the cartridge-case. The cartridge-case can be recharged on an average about eight times. THE CARRIAGE. Weight complete 241 pounds Height of axis of trunnions above ground 27.55 inches Diameter of the wheel 37.4 " Track of wheel 2.46 feet [Illustration: Fig. 8.] NOMENCLATURE (see Fig. 8).--(_a_) trail; (_b_) axle; (_c_) wheel; (_d_) cap-squares; (_e_) breast-transom; (_f_) elevating-screw; (_g_) lunette; (_h_) hook. DESCRIPTION. The carriage-body consists of two steel brackets forming cheeks and trail. They are reinforced by angle-steel and connected by transoms. The axle is secured in beds riveted to the brackets, and is arranged to be readily dismounted when required. The elevating-gear consists of a simple screw working in a stout steel transom, and supports the breech of the gun; the preponderance is sufficient to insure stability. The sponge and rod are secured to the right side of the trail by suitable attachments. A pole is provided for draught when easy country is encountered, and provision is made for attaching it to the lunette. The following articles are carried in the gunner's haversack: 1 tangent-sight; 1 lanyard; 1 spare-extractor; 1 spare stop-bolt; 1 dismounting-pin; 1 oil-can; 2 cleaning-brushes; 1 screw-driver; 1 pair cutting-pliers; 1 vent-cleaner; friction-primers.