Abstract
In order to find out at what height of the atmosphere large-scale mixing (winds) ceases to occur, Prof. F. A. Paneth and E. Gliickauf have determined the percentage of helium in samples of air obtained by means of sounding balloons sent up from Kew. Up to a height of 18 km., the percentage remains practically constant, but at 21 km. a noticeable increase (8 per cent) was observed. The authors ask the co-operation of stratosphere investigators in various parts of the world in order to obtain small samples of air from high altitudes.
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Points from Foregoing Letters. Nature 136, 723 (1935). https://doi.org/10.1038/136723c0
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DOI: https://doi.org/10.1038/136723c0