Abstract
THERE was a dense haze overlying Southern England on June 6, becoming worse towards evening and greatly interfering with visibility. It was very marked in Surrey in the neighbourhood of Epsom, where the race-goers found it difficult to see clearly. Records of this haze taken with my dust-counter at Cheam, between 7 and 7.30 P.M., gave a greyish deposit of dust particles upon the cover-glass. These particles varied in diameter from 1½ microns down to ultra-microscopic size; the average diameter was about ½ micron. Most of them were irregular in shape and insoluble in water, but scattered among the irregular dust particles were a number of small spheres. The proportion of these spheres present was about 3 per cent. of the total number of dust particles. They were transparent and usually colourless, but some were distinctly brown or reddish. The maximum diameter of the spheres found was 1½ microns, but most of them were less than this. They were insoluble in water. The haze was unusually dense for a country district, and the number of dust particles per cubic centimetre was between 9000 and 10,000.
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OWENS, J. Haze on Derby Day—June 6. Nature 111, 848 (1923). https://doi.org/10.1038/111848b0
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DOI: https://doi.org/10.1038/111848b0
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