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.
Formidable-class battleship The Royal Navy's Formidable"-class battleships were an eight-ship class of pre-dreadnoughts designed by Sir William White and built in the late 1890s. The class is often further divided into a separate London" class, and the "London" class sometimes is divided further into a separate "Queen" class. Alongside the King Edward VII class, they were the largest class of battleships built, with eight complete vessels.