The 26 cm RK L/20 was a gun from a family of Krupp naval artillery guns designed in the late 1860s. The gun resembled the 26 cm RK L/22, but was shorter, so it could be used in the central battery of
The 26 cm RK L/20 model 1870
Turret ships were a 19th-century type of warship, the earliest to have their guns mounted in a revolving gun turret, instead of a broadside arrangement.
Turret of USS Monitor, one of the first turret-armed warships
HMS Prince Albert, a pioneering turret ship, built by naval engineer Cowper Phipps Coles.
HMS Captain was one of the first ocean-going turret ships.
Inboard plans of USS Monitor.