Which 20th century battleship featured artillery with a specially reinforced barrel and steam turbine propulsion?
Built-up gun A built-up gun is artillery with a specially reinforced barrel. An inner tube of metal stretches within its elastic limit under the pressure of confined powder gases to transmit stress to outer cylinders that are under tension. Concentric metal cylinders or wire windings are assembled to minimize the weight required to resist the pressure of powder gases pushing a projectile out of the barrel. Built-up construction was the norm for guns mounted aboard 20th century Dreadnoughts and contemporary railway guns, coastal artillery, and siege guns through World War II.
USS Delaware (BB-28) USS "Delaware" (BB-28) was a dreadnought battleship of the United States Navy, the lead ship of her class. She was laid down at Newport News Shipbuilding in November 1907, launched in January 1909, and completed in April 1910. The sixth ship to be named for the First State, "Delaware" was armed with a main battery of ten 12 in guns all on the centerline, making her the most powerful battleship in the world at the time of her construction. She was also the first battleship of the US Navy to be capable of steaming at full speed for 24 continuous hours without suffering a breakdown.