On the right side of the cradle is mounted the Range Quadrant which has in combination with it the Angle of Site Mechanism. For indirect fire the gunner on the right of the piece lays for range with this instrument. =Fixed ammunition= is used with this gun. Shrapnel and high explosive shell are used. The base fuzed steel shell and the shrapnel weigh 60 lbs. The point fuzed steel shell weighs 45 lbs. Gas shell are also issued identical with the 45 lb. steel shell. CHAPTER X THE 155-MM FILLOUX GUN. WEIGHTS, DIMENSIONS, ETC. Weight of Gun including breech mechanism 8,795 lbs. Length 232.87 inches. Caliber 155-mm (6.1042 inches.) Muzzle velocity 2,380 ft.-sec. Rifling, one turn in 2.989. Caliber, right hand uniform. Weight of projectile 95 lbs. Maximum range 16,200 meters. Weight of maximum powder charge 25¼ lbs. Weight of carriage 11,065 lbs. Weight of gun and carriage, complete 19,860 lbs. Diameter of wheels 1,160mm. Width of track 2,250 mm. Height of axis of gun 1,482 mm. Elevation 0 to 35 degrees. Maximum traverse 60 degrees. Weight of limber complete 3,190 lbs. Weight of gun carriage and limber 23,050 lbs. The distance from center line of carriage axle to center line of limber axle, approximately 4,500 mm. [Illustration: _155 M.M. GUN_ _MODEL OF 1918_ (_FILLOUX_)] _The gun_ is of the built-up type and consists of the tube strengthened by the following jackets and hoops beginning at the breech end: The breech ring, the jacket, the hoop A, the hoop B, the clip hoop, the clip hoop set on the hoop B and the muzzle bell. The length of the gun from the muzzle to the breech base is approximately 18½ feet. A recoil lug on the underside of the breech ring provides means of attaching the recoil and recuperator rods. Hinge lugs for the breech are also formed on the breech ring. Bronze clips to serve as guides in the cradle are screwed to the sides of the jackets. _The breechblock_ is of the interrupted screw type, having four plain and four threaded sectors. The breech mechanism is of the plastic obturator type, having the forward mushroom-shaped head of the breechblock equipped with the asbestos ring, known as the obturator pad. Upon firing, this ring is compressed and acts as a gas check to prevent the leakage of powder gases back through the breech. It has sufficient resiliency to resume its original form after firing. The firing mechanism is of the French percussion primer type which is described under “155-mm Schneider howitzer” and is interchangeable with the guns enumerated therein.