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.
12&quot;/50 caliber Mark 7 gun The 12"/50 caliber Mark 7 gun (spoken "twelve-inch-fifty-caliber") was a United States Navy's naval gun that first entered service in 1912. Initially designed for use with the "Wyoming"-class of dreadnought battleships, the Mark 7 also armed the Argentine Navy's "Rivadavia"-class battleship s.