Bjørn Helland-Hansen (16 October 1877 – 7 September 1957) was a Norwegian pioneer in the field of modern oceanography. He studied the variation patterns of the weather in the northern Atlantic Ocean and of the atmosphere. He developed the "Helland-Hansen Photometer" in 1910, which was carried on board Michael Sars. It was operated for the first time close to the Azores at a depth between 500 and m.
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