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In page HMS Lord Clyde (1864):

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The shell of the nine-inch gun weighed 254 pounds (115.2 kg) while the gun itself weighed 12 long tons (12 t). It had a muzzle velocity of 1,420 ft/s (430 m/s) and was rated with the ability to penetrate 11.3 inches (287 mm) of wrought-iron armour.[2] The eight-inch gun weighed nine long tons (9.1 t); it fired a 175-pound (79.4 kg) shell at a muzzle velocity of 1,410 ft/s (430 m/s) and was credited with the ability to penetrate 9.6 inches (244 mm) of armour.[2]