George Francis FitzGerald
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- 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. (p. 18)
- If Universities do not study useless subjects, who will?
- (25 February 1892)"The Value of Useless Studies". Nature. (p. 392)