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Updated: May 26, 2025
Pouillet's result was not definitely superseded until Violle, from actinometrical measures at the summit and base of Mont Blanc in 1875, computed the intensity of solar radiation at 2.54, and Crova, about the same time, at Montpellier, showed it to be above two calories. Langley went higher still.
M. Savélieff deduced for it a value of 3.47 from actinometrical observations made at Kieff in 1890; and Knut Ångström, taking account of the arrestive power of carbonic acid, inferred enormous atmospheric absorption, and a solar constant of four calories.
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