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Rjukan–Notodden Industrial Heritage Site is a World Heritage Site in Telemark county, Norway, created to protect the industrial landscape around Lake Heddalsvatnet. The landscape is centered on the plant built by the Norsk Hydro to produce fertilizer from atmospheric nitrogen. The complex also includes hydroelectric power plants, transport systems, including railways, transmission lines and factories, and workers' accommodation and social institutions in the towns of Notodden and Rjukan. The site was placed on the tentative World Heritage list on 19 June 2009 together with the Odda–Tyssedal Industrial Heritage Site.〔 On 5 July 2015 it was placed on the World Heritage list,〔 under Criteria II and IV, with following description of the Outstanding Universal Value: ==History== In the 1900s, Norway experienced rapid industrial development through the availability of cheap hydroelectric power. Kristian Birkeland developed a method to extract nitrogen from the air, which, after an initial trial in Notodden in 1907, looked superior to existing technologies. Nitrogen was needed to produce fertilizers. Norsk Hydro was founded in 1905, and industrial development began in the Eastern Telemark region, previously an underdeveloped and underpopulated agricultural area. To produce fertilizers, it was essential to build factories, power stations, infrastructure for workers, as well as facilities for exporting the production. The fertilizers, artificial saltpetre, eventually surpasses the Chilean naturally mined saltpeter, at the time the most widely used fertilizer.〔(【引用サイトリンク】title=Rjukan/Notodden and Odda/Tyssedal Industrial Heritage Sites, Hydro Electrical Powered Heavy Industries with associated Urban Settlements (Company Towns) and Transportation System )〕 At the beginning of construction, in 1907, the power was provided by the Svelgfoss Hydroelectric Power Station, which at the time was the largest in Europe and the second larges at the world.〔 The station is still in operation. Subsequently, two more station were built. Vemork, built on a waterfall near Rjukan, in 1911 was the largest power station in the world. A plant producing heavy water and most famous for the 1943 sabotage events (Operation Gunnerside) was built nearby. The original building of the station has been destroyed, but the station is in operation.〔 Another power plant, Såheim Hydroelectric Power Station, started operation in Rjukan in 1915. The building survived but the station operates elsewhere.〔 One of the 36 towers of the saltpetre factory's towerhouse, which was in operation between 1911 and the 1980s, has been conserved and is protected as a cultural monument.〔 In 1925, 80% of all apartments in Rjukan (1230 in total) were controlled by the Norsk Hydro. Red brick apartment buildings dominated, others were houses with individual gardens.〔 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「Rjukan–Notodden Industrial Heritage Site」の詳細全文を読む スポンサード リンク
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