Abstract
IN NATURE, vol. xii. p. 98, you notice a paper by Dr. Hann on two rival theories of cyclones. According to one, “whirl-winds are formed mechanically by different streams of air meeting, and centrifugal force causes the central depression. The more modern theory regards a local depression as the first condition, causing an indraft resulting in a whirlwind through the earth's rotation: the primary depression is held to follow condensation of vapour.”
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MURPHY, J. Theories of Cyclones. Nature 12, 187 (1875). https://doi.org/10.1038/012187c0
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DOI: https://doi.org/10.1038/012187c0
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