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HMS Investigator (1848)
HMS ''Investigator'' was a merchant ship purchased in 1848 to search for Sir John Franklin's lost expedition. She made two voyages to the Arctic and had to be abandoned in 1853 after becoming trapped in the ice. Her wreckage was found in July 2010 on Banks Island, in the Beaufort Sea. She was the fourth ship of the Royal Navy to bear the name.
==Construction and purchase==
Built at Scotts of Greenock on the Firth of Clyde and running 422 tonnes, ''Investigator'' was purchased by the Admiralty in February 1848 and was fitted for Arctic exploration by R. & H. Green at Blackwall Yard on the River Thames.〔Winfield & Lyon (2004), p. 141〕
She was strengthened for Arctic service by William M. Rice, Master Shipwright of Woolwich Dockyard. She was extensively strengthened with timber (teak, English oak, Canadian elm) and inch (8 mm) steel plating. Ten pairs of iron diagonal riders were set in the hold, with ten pairs of diagonal plates on the sides of the vessel between decks. To cope with snow and ice loads, the upper decks were doubled with fir planking. Preston's Patent Ventilating Illuminators were installed to improve light and ventilation. Sylvester's Warming Apparatus, a modern stove system capable of warming the entire ship, was also employed with good results.〔Armstrong (1857)〕 The same or similar device had been used by William Edward Parry in 1821 to prevent condensation and aerate the lowest deck.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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