Tinn is a municipality in Telemark in the county of Vestfold og Telemark in Norway. It is part of the traditional regions of Upper Telemark and Øst-Telemark. The administrative centre of the municipality is the town of Rjukan.
The parish of Tin(d) was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The area of Hovin was separated from the municipality of Tinn in 1860, but it was merged back into the municipality of Tinn on 1 January 1964.
Krossobanen is the oldest aerial tramway in Northern Europe. It was built in 1928 as a gift from Norsk Hydro. There is a museum and Hardangervidda National Park center at the lake Møsvatn close to Tinn.
The Old Norse form of the name was Tinnr. It is probably the old name of the Lake Tinn, the central lake in the municipality. The meaning of the name is unknown.
The coat-of-arms is from modern times. They were granted on 18 November 1994. The arms show five blue drops of water on a silver background. It was chosen to represent the five rivers in the municipality and the hydropower of Rjukan. It was designed by Halvor Holtskog. Coat-of-arms of Bykle and Samnanger.
Rjukan Falls on the Måna river allowed construction of Vemork, the largest power station in the world in 1911. The station has become a museum where one can explore the history of the energy and see exhibits about the industrial development in Norway and at Rjukan, the municipality center of Tinn.
The museum is most famous for its presentation of Rjukan's war history. During World War II, Vemork was the site of the Norwegian heavy water sabotage, when Norwegian saboteurs prevented the Germans from producing nuclear weapons from the heavy water which was produced here. The exhibit Atomkappløpet ("The nuclear race") presents the four heavy water sabotages and the allied efforts to develop a nuclear bomb.
The municipality borders the municipality of Nore og Uvdal (in Buskerud county) to the north, Rollag and Flesberg (also in Buskerud) to the east, Notodden, Hjartdal, and Seljord to the south, and Vinje to the west.
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Rjukan (ˈrʉ̀ːkɑn) is a town and the administrative centre of Tinn municipality in Telemark, Norway. It is situated in Vestfjorddalen, between Møsvatn and Lake Tinn, and got its name from the Rjukan Falls west of the town. The Tinn municipality council granted township status for Rjukan in 1996. As of 2022, the town has 3,003 inhabitants. The town was essentially "built from scratch" with industrial developments by Norsk Hydro in the 1910s and 20s. At its peak, Rjukan was a significant industrial center of Telemark.
The Norwegian heavy water sabotage (Tungtvannsaksjonen; Tungtvassaksjonen) was a series of Allied-led efforts to halt German heavy water production via hydroelectric plants in Nazi Germany-occupied Norway during World War II, involving both Norwegian commandos and Allied bombing raids. During the war, the Allies sought to inhibit the German development of nuclear weapons with the removal of heavy water and the destruction of heavy-water production plants.
Møsvatn or Møsvann is a lake in Vinje Municipality in Vestfold og Telemark county, Norway. It is the tenth-largest lake in Norway with a surface area of and a volume of . The lake lies just east of the Hardangervidda National Park, in Skien watershed (Skiensvassdrag) catchment area. The lake discharges into the Måna river at a dam located on the Vinje-Tinn municipal border (so a very small part of the lake crosses into Tinn Municipality too). The lake has an irregular shape with three arms.