Monitor
Naval
The turreted ironclad vessel designed by Mr. John Ericsson in 1861 was named the Monitor, and that name has become a general designation for all vessels of that type. The Monitor drew about twelve feet of water, the hull was almost immersed, and the cylindrical turret revolved so that an all-round fire could be maintained while the vessel remained stationary. The Confederates called this vessel "cheese-box on the raft."
