“When two surfaces at different temperatures are in presence of one another with a gas between them, there exists a force tending to separate them. The assumption of this force explains a very great number of phenomena, including the motion of the arms of Mr. Crooke's radiometers and the so-called spheroidal state of liquids.”

March 1878 quoted in [The Scientific Writings of the Late George Francis FitzGerald, https://books.google.com/books?id=2le7lpdAJ5EC&pg=PA18] (p. 18)

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George Francis FitzGerald 2
Irish physicist 1851–1901

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