Fig. 50.
| Metal | steel |
| Total length | 2.05 feet |
| Calibre | 3.6 inches |
| Weight | 245 pounds |
| Grooves | 20 |
| Twist of rifling | 1 in 40 to |
| 1 in 25 cal. | |
| Powder-chamber | cylindrical |
| Vent | axial |
| Muzzle velocity | 650 ft.-sec. |
| Maximum range | 3450 yards |
It consists of a single piece of steel, the trunnions being forged solid with the piece.
Fig. 51.
The breech mechanism, [Fig. 51], is generally similar to that of the field-guns, except that the Freyre obturator is used, and in the locking arrangement the lever-handle is replaced by a bolt (a) which is turned by hand. This bolt operates the locking-stud on the left side of the block, and its handle bears also a vent-shield (f,) which keeps the vent closed until the breech is locked.
THE CARRIAGE FOR 3.6-INCH B. L. MORTAR.
Fig. 52.