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Nelson-class cruiser
The ''Nelson''-class cruisers were a pair of armoured cruisers built in the 1870s for the Royal Navy.
==Design and description==
The ''Nelson''-class ships were designed by Nathaniel Barnaby, Chief Constructor of the Royal Navy, as enlarged and improved versions of HMS ''Shannon'' to counter the threat of enemy armoured ships encountered abroad. The ships were not much liked in service as they were deemed too weakly armoured to fight ironclad battleships and not fast enough to catch commerce-raiding cruisers. They were laid out as central battery ironclads with the armament concentrated amidships.〔Parkes, pp. 239, 241〕
The ''Nelson''s had a length between perpendiculars of , a beam of and a deep draught of . The ships displaced , about more than ''Shannon''. The steel-hulled ships were fitted with a ram and their crew numbered approximately 560 officers and other ranks.〔
The ships had two 3-cylinder, inverted compound steam engines, each driving a single two-bladed, propeller, using steam provided by 10 oval boilers. They generated a working pressure of so that the engines produced (''Nelson'') or (''Northampton''). The cylinders of the latter's engines could be adjusted in volume to optimize steam production depending on the demand. They were troublesome throughout the ship's life and she was always about slower than her sister despite repeated efforts to improve her speed. On their sea trials, ''Nelson'' reached her designed speed of , but ''Northampton'' could only reach .〔Parkes, pp. 239, 242–43〕
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