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Updated: May 26, 2025
A study of cyclones and tornadoes, or even of the little air-whirls which in hot weather lift the dust of our streets, shows that the particles of the atmosphere in rushing in toward the centre of upward movement take on the same whirling motion as do the molecules of water in the basin in fact, the two actions are perfectly comparable in all essential regards, except that the fluid is moving downward, while the air flows upward.
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