This gun, which has been experimented with in the English Navy, is intended as a defence against torpedo-boats. It has four barrels placed in line, having a calibre of one inch, to fire a half-pound steel projectile. The projectiles are placed in guides behind the rear of the barrels, and by the movement of a lever are sent into the chamber, fired, and the empty shell extracted. Gearing worked by hand-wheels gives elevation and direction. The fire is rapid from this gun, and the results have been excellent for penetration. Weight of the gun complete, about 1000 pounds. [Illustration] _The Palmcrantz Machine-Gun._ The Palmcrantz mitrailleuse is a machine-gun for firing small-arm ammunition. It has ten barrels placed side by side and secured in a frame, the rear ends of the barrels being screwed into a single bar-transom, behind which the lock mechanism is placed in a flat rectangular box. The system is mounted on a swivel in such a manner as to give it free motion for elevating and depressing or sweeping. An eccentric cam attached to the crank-axle can be thrown into gear, by means of which the barrels are given an automatic sweep through a small arc. The whole gun is compact and light. Each barrel has a separate feeder, so that the velocity of discharge is very great, the barrels being fired in succession. RUSSIAN ORDNANCE. A = Calibre. B = Length over all. C = Number of Grooves. D = Twist of Rifling. E = Weight of Gun, including Breech-block. F = Preponderance. -----------------+------+-------+----+----+--------+------- NAME, NATURE, AND| | | | | | CLASSIFICATION. | A | B | C | D | E | F -----------------+------+-------+----+----+--------+------- | In. | In. | |Cal.| Lbs. | Lbs. Krupp Russian pattern steel Breech-loaders. Finished. | | | | | | 12 in. | 12 | 240.8 | 36 | | 89,173 | 1,958 11 ” | 11 | 219 | 36 | 70 | 57,280 | 0 9 ” | 9 | 180 | 32 | 60 | 33,150 | 440 9 ” | 9 | 156 | 32 | 60 | 29,920 | 748 8 ” | 8 | 175 | 30 | 60 | 19,820 | 440 Unfinished. | | | | | | 6 ” | 6 | 140 | 24 | 45 | 9,370 | 352 8 ” | 8 | 175 | 30 | 60 | 17,570 | 792 6 ” | 6 | 146 | 24 | 45 | 10,090 | 1,078 9 pdr. | 4.2 | | 16 | | 1,738 | 4 ” | 3.4 | 70 | 12 | 40 | 792 | 88 Bronze Rifled Muzzle-loaders. 8 pdr. | 4 | | | | 1,650 | 4 ” | 3.4 | | | | 809 | +------+-------+----+----+--------+------- 4 ” | 3.4 | | | | 865 | | | | | | |