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In page HMS Lord Clyde (1864):

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The entire side of Lord Clyde's hull, except for the side of the upper deck, was protected by wrought-iron armour that tapered from 4.5 inches (114 mm) at the ends to 5.5 inches (140 mm) amidships. It extended 6 feet (1.8 m) below the waterline. The forward chase guns on the upper deck were protected by 4.5-inch armour plates on the sides of the hull and a 4.5-inch transverse bulkhead to their rear protected them from raking fire. The armour was backed by 30 inches (762 mm) of oak and the 1.5 inches (38 mm) iron skin of the ship.[1]