Pennsylvania-class battleship

The Pennsylvania class was a pair of super-dreadnought battleships of the United States Navy, Pennsylvania and Arizona. They enlarged the preceding Nevada class, with two more 14-inch guns for twelve in four triple turrets, greater length and displacement, four propellers and a slightly higher speed, and they carried a very large secondary battery of 5-inch guns that was soon reduced because many positions proved too wet. The Navy awarded the contract for Pennsylvania to the lowest bidder, Newport News, in February 1913, and she was laid down that October. Both ships burned oil and were rebuilt in 1929 to 1931 with tripod masts, better gun elevation and aircraft catapults. Both were at Pearl Harbor, where Arizona was sunk by a magazine explosion and became a memorial, while Pennsylvania survived, bombarded shores for much of the war and was expended as a target ship in 1948.