Abstract
LONDON. Royal Meteorological Society, June 14.—Dr. H. N. Dickson, president, in the chair.—Dr. C. Chree: Discussion of the barograph records kept by the late Mr. P. Bell at Castle Oer, Dumfriesshire, during the seven years 1902-8. The records show a well-marked principal maximum and minimum at 10 p.m. and 5 a.m. respectively. Every single year agrees in this except 1908, which puts the maximum at 7 a.m. The existence of a secondary maximum and minimum is unmistakable, but while the hour of occurrence of the former is clearly 11 a.m., that of the latter is less distinct. It seems to be 4 p.m., but a longer series of observations would have been necessary to confirm this.—Spencer C. Russell: Experiments carried out at Epsom during the last two years in order to obtain a permanent record of the variations in the size of raindrops as and when they occurred. The first method employed was the exposure of a number of ruled slates divided into 7-inch sections, and gently brushed over with an even coating of oil. This was not altogether satisfactory, as during heavy rain the drops impinged upon the slate with such force as to become broken up into a series of drops composed of one large and a number of small ones. The most satisfactory results, however, have been given by the use of plaster of Paris. Mr. Russell exhibited to the meeting a number of these raindrop models. He stated that the sizes of the drops which he had already collected were:—7 of 6 mm., 44 of 5 mm., 73 of 4 mm., 222 of 3 mm., 257 of 2 mm., 175 of 1 mm., and 107 of less than 1 mm.—A. J. Makower, Dr. W. Makower, W. M. Gregory, and H. Robinson: Experiments carried out at Ditcham Park to investigate the electrical state of the air at different heights above the ground by means of kites and balloons.
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Societies and Academies . Nature 86, 575–576 (1911). https://doi.org/10.1038/086575b0
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DOI: https://doi.org/10.1038/086575b0