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Caption: Iron screwship with turrets HMS Monarch

This Royal Navy warship, launched in May 1868, was one of the first iron-built battleships fitted with turrets enclosing and rotating its four 25-ton (25.4 mt) 12-inch (30.4 cm.) guns. One of the largest and fastest battleships of its day, HMS Monarch had a displacement of 8820 tons (8962 mt), armour six to seven inches (15-18 cm) thick and a top speed of 15 knots (27.8 kph).