HMS 'Monarch', 1911.
© Science Museum / Science & Society Picture Library
Model. The 'Monarch', and her sister ships, the 'Orion', the 'Conqueror' and the 'Thunderer' (all completed in 1912), were battleships of the 'Improved Dreadnought' type. This was the first group of warships to have ten 13.5-inch guns, and also the first to carry the main armament in turrets on the centre line. They were mounted in pairs in five hooded barbettes. There was a secondary armament of 16 4-inch guns. The ships were 581 ft long, with a displacement of 22,500 tons and propelled by quadruple-screw turbine engines. HMS Monarch and her three sister ships all fought at the Battle of Jutland in 1916.