Norwegian astronomer and meteorologist (1835-1916) who founded the field of meteorological research in Norway, serving as director of the Norwegian Meteorological Institute from 1866 to 1913. ALS in French, signed "H. Mohn," one page, 8.25 x 11, Norske Meteorologiske Institut letterhead, March 25, 1907. Interesting untranslated letter concerning his work relative to the meteorological observations of Fridtjof Nansen's 'Fram' polar expedition. In fine condition, with intersecting folds and a tiny burn hole beneath his signature.
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