Part 2 of 2 +---------+----------+-------------+----------+----------+-----------+ | | | Penetration | Muzzle | | | | | Muzzle | in | Energy | Weight | Weight of | | GUN. | Energy. |Wrought-iron.| per Ton | of Gun. | Carriage. | | | | | of Gun. | | | +---------+----------+-------------+----------+----------+-----------+ | | Ft.-Tons.| Inches. | Ft.-Tons.| Pounds. | Pounds. | | 5-inch | 1,525 | 10.7 | 552 | 6,187 | 4,200 | | 6-inch | 2,542 | 13.2 | 521 | 11,000 | 6,400 | | 8-inch | 7,285 | 18.2 | 560 | 28,000 | 14,000 | | 10-inch | 15,285 | 23.7 | 588 | 58,240 | 32,482 | | 12-inch | 25,985 | 27.6 | 591 | 44 tons | .... | | 14-inch | 41,270 | 32.2 | 550 | 75 tons | .... | | 16-inch | 61,114 | 36.8 | 571 | 107 tons | .... | +---------+----------+-------------+----------+----------+-----------+ This _energy_, total energy, expresses the work that the gun can perform. It is expressed in foot-tons, and signifies that the energy developed is sufficient to raise the weight in tons to a height of one foot. Thus the projectile from the small 5-inch gun, weighing sixty pounds, fired with a charge of thirty pounds of powder, leaves the gun with an energy capable of lifting 1525 tons to the height of one foot! Comparing this with the energy developed by the 100-ton hammer at the forge of Le Creuzot in France, the energy of which is 1640 foot-tons, we have a most striking illustration of the power of gunpowder, and the testimony in the table as to the energy developed per ton of gun more forcibly exhibits the perfection of a manufacture which, with so little weight of gun, can develop such gigantic power. [Illustration: UNBURNED AND PARTIALLY CONSUMED GRAINS OF U.S.N. POWDER]