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The comparative test of solid and laminated armor has already been mentioned. The best 4-1/2-inch solid plates, well backed, are practically proof against the guns of English iron-clads, namely, 68-pounder smooth-bores and Armstrong 110-pounder rifles, the service charge of each being 16 pounds. Rifling and Projectiles.
The 110-pounder Armstrong rifle has 99-1/2 inches length and 7 inches diameter of bore, 27 inches maximum diameter, and weighs 4-1/3 tons. The "300-pounder" smooth-bore has 11 feet length and 10-1/2 inches diameter of bore, 38 inches maximum diameter, and weighs 10-1/2 tons.
The former carries 5, and the latter 6 of Captain Coles's turrets with inclined sides, each turret designed for two 110-pounder breech-loading Armstrong guns. The class of iron vessels constructing to carry two of Coles's turrets are 175 feet long, having 42 feet beam, 24 feet depth, 17 feet draught, and 990 tons displacement. All these English vessels are much higher out of water than Ericsson's.
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