-------------------+------------+---------+---------+--------------+--------------+ Weight. | | | | | Thickness of | | | | Energy | Energy | Wrought Iron | -------+-----------+ Muzzle | Total | per Ton | per Inch |Plate the Shot| | | Velocity. | Energy. | Weight | of Shot's | is Capable of| Charge.|Projectile.| | | of Gun. |Circumference.| Perforating. | -------+-----------+------------+---------+---------+--------------+--------------+ lb. | lb. |ft. per sec.|ft. tons.|ft. tons.| ft. tons. | in. | 12 | 40 | 1,680 | 783 | 522.0 | 53.1 | 7.0 | 16 | 40 | 2,078 | 1,198 | 532.4 | 81.3 | 9.1 | 42 | 80 | 2,060 | 2,354 | 588.5 | 125.7 | 11.6 | 45 | 100 | 1,940 | 2,610 | 580.0 | 139.4 | 12.2 | 60 | 100 | 2,146 | 3,193 | 580.5 | 170.5 | 13.5 | 60 | 120 | 2,050 | 3,497 | 466.3 | 160.2 | 13.0 | 75 | 145 | 2,020 | 4,075 | 479.4 | 186.6 | 14.1 | 80 | 145 | 2,140 | 4,604 | 511.5 | 210.9 | 14.9 | 120 | 180 | 2,177 | 5,915 | 514.3 | 236.9 | 15.8 | 120 | 200 | 2,157 | 6,452 | 537.6 | 258.4 | 16.5 | 130 | 210 | 2,236 | 7,280 | 520.0 | 291.5 | 17.5 | 175 | 320 | 2,060 | 9,412 | 495.3 | 327.5 | 18.5 | 200 | 380 | 2,035 | 10,923 | 508.0 | 380.1 | 20.0 | 230 | 380 | 2,375 | 14,800 | 616.6 | 515.0 | 23.2 | 200 | 450 | 1,910 | 11,383 | 455.3 | 364.2 | 19.5 | 270 | 470 | 2,185 | 15,560 | 576.3 | 497.9 | 22.8 | 270 | 500 | 2,213 | 16,979 | 566.0 | 543.3 | 23.8 | 330 | 700 | 2,087 | 21,141 | 491.6 | 563.1 | 24.2 | 400 | 800 | 2,117 | 24,861 | 540.4 | 662.2 | 26.2 | 450 | 850 | 2,205 | 28,665 | 562.0 | 763.6 | 28.1 | 850 | 1,800 | 2,106 | 55,377 | 595.4 | 1,088.7 | 33.5 | 900 | 1,800 | 2,216 | 61,200 | 556.4 | 1,203.2 | 35.2 | 900 | 1,800 | 2,295 | 65,745 | 517.6 | 1,292.6 | 36.5 | 827 | 2,000 | 1,932 | 51,790 | 517.9 | 973.1 | 31.7 | 1,000 | 2,000 | 2,190 | 66,512 | 573.3 | 1,249.7 | 35.8 | 1,000 | 2,000 | 2,255 | 70,520 | 514.7 | 1,325.0 | 37.0 |