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Les Hanois Lighthouse was constructed between 1860 and 1862 to a new design by James Douglass, and was first lit on 8 December 1862. It is sited on the rock known as Le Biseau, or Le Bisé one mile north west of Pleinmont where the Trinity House cottages were built, and was erected in response to an increasing number of shipwrecks on the treacherous rocks off the western coast of Guernsey, including the wreck of () in 1807 An article appeared in The Times on 15 July 1850 asking about the necessity of a Lighthouse at Pleinmont Point The lighthouse was constructed in Cornish granite rather than stone from Guernsey. Cornish masons were employed to dress the stone on the castle pier in Saint Peter Port.〔 Construction workers were accommodated in Fort Grey. The tapered granite tower, painted white, is notable in terms of lighthouse engineering because it was the first to be built with all the stones dovetailed together both laterally and vertically, thereby making the construction a single solid mass. The cement mortar in the joints formed between stone faces lock the dovetails so that the stones cannot be separated without being broken. This method, used for the first time at the Hanois Lighthouse, became the pattern adopted for subsequent lighthouses built on sea rocks. The helicopter pad on top of the lighthouse was built in 1979. The lighthouse was demanned in January 1996 following automation. Conversion to work from solar power required a slowing down of the optic, changing the character of the light, so as to reduce the power requirement and deliver the range required. Its role is to provide a mark warning of the reefs and rocks to the west of Guernsey and providing a position fix for vessels entering the Channel Traffic Separation Scheme. Le Hanois reef includes, besides Le Bisé, the following rocks: Le Grand Hanois, Le Petit Hanois, La Percée, Round Rock and La Grosse Rocque.〔 ==See also== *List of lighthouses in the Channel Islands 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Les Hanois Lighthouse」の詳細全文を読む スポンサード リンク
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