The main organ was built by the Steinmeyer firm in 1930, and was erected in the north transept.
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He also painted some historical subjects including the coronation of King Haakon VII of Norway and Queen Maud (Kong Haakon og Dronning Mauds kroning i Nidarosdomen, 1906) in Nidaros Cathedral.
Accordingly, on 23 June 1991, they attended a service of consecration at Nidaros Cathedral, presided over by Bishop Finn Wagle, assisted by the Bishop of Oslo, Andreas Aarflot.
In 1907 the architect Gabriel Kielland (1871–1960) won a competition for new paintings for Nidaros Cathedral's southern gable.
It starts in the ancient part of Oslo and heads north along the lake Mjøsa, up the Gudbrandsdal valley, over the Dovrefjell mountains, and down the Oppdal and Gauldalen valleys to end at the Nidaros Cathedral in Trondheim.