Abstract
THE rising of plant-down on calm, sunny days as-described by Prof. Miles Walker in NATURE of October 20, p. 242, has also been noticed by me occasionally. But could not the upward motion be explained by an upward current of air? We know that the air is usually full of eddies on a hot afternoon. In order to prove that the thistledown moved through, instead of with, the air, it would be necessary to make simultaneous and contiguous measurements of air-motion by means of smoke or of some very special anemometer. It would be interesting to learn if anyone has tried such an experiment.
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RICHARDSON, L. The Flight of Thistledown. Nature 108, 340 (1921). https://doi.org/10.1038/108340d0
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DOI: https://doi.org/10.1038/108340d0
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