Turret ship
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Turret ships were a 19th century type of warship, the earliest to have their guns mounted in a revolving turret, instead of a broadside arrangement.
The first experiment was the addition of a turntable-mounted shielded gun to HMS Trusty (a floating battery) in 1861. The USS Monitor, built in 1862, is more famous, being a ship mounted only with the turret and taking part in battle. Pressure from the Royal Navy's proponent of turrets, Captain Cowper Phipps Coles, led to the building of HMS Captain to his design in 1869. She was a low freeboard design and capsized during a heavy gale while under sail. HMS Monarch and HMVS Cerberus built at the same time proved more durable and HMS Devastation of 1871 led directly to the modern battleship.
Turret ship may be found applied to a type of late 19th century commercial steam vessel designed to minimize Suez Canal fees that were based on deck area. Turret Deck Ship is a more precise term for these vessels.