The Agamemnon-class (sometimes known as the James Watt class) steam battleships, or steam ships of the line, were a class of five 91-gun steam second rates of the Royal Navy. The original design was produced by John Edye in 1847, as a response to the French Le Napoléon, which was rumoured to be under development.

The first ship of the class, Agamemnon, was originally designed as a two-decker, 80-gun sailing ship of the line, but was re-ordered as the first purpose-built steam screw ship for the British Navy.Winfield, pp. 35, 37

Ships

Builder: Woolwich Dockyard Ordered: 25 August 1849 Launched: August 1852 Fate: Sold, 12 May 1870

Builder: Pembroke Dockyard Ordered: 14 January 1850 Launched: 23 April 1853 Fate: Sold, 23 January 1875

Builder: Pembroke Dockyard Ordered: Launched: 27 September 1855 Fate: Sold, 1898

Builder: Woolwich Dockyard Ordered: Launched: 23 October 1858 Fate: Sold, 1904

Builder: Chatham Dockyard Ordered: Launched: 15 April 1858 Fate: Sold, 20 June 1871

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