Cirro-stratus and Cirrus Radiant, radiant point N. Scud moving across sky in front of Nimbus clouds from the East. Temperature rising. Barometer falling slightly. 8 p.m. Cloudy, calm day. Temperature rising and barometer steady. May 2nd, 1911. 8 a.m. Clear and calm. Barometer fallen a little. Temperature rising. Fracto-cumulus clouds rather whale-backed in shape, moving from the S. K. 6 p.m. Calm and clear. Temperature and barometer stead}'. 8 p.m. N.W. wind at 7, force 3. At the 8 o'clock observation the wind was S. to E. force 1. Barometer rising and temperature falling slightly. May 3rrf, 1911. 10 a.m. ('aim and steady. Clouds from the N.W. covering the Northern half of the sky. Barometer steady and temperature high. 8 p.m. Bright and calm till the afternoon, then clouding over. A little snow falling at the 8 p.m. observations. Barometer steady. Temperature oscillating. May 4th, 1911. 8 a.m. Heavy snowclouds to N. and S. Scud along Cape Adare. Calm. Clear at zenith. Barometer fallen. Temperature steady. 10 a.m. Southerly wind of force 4 blew from 9 a.m. to 9.30 a.m. There has been a long lull since. Can make out no movement in the upper clouds. Scud forming on Cape Adare. 12 noon.
* As the reflecting power of snow is practically the same as that of clouds, changes of cloud amount in polar regions do not affect appreciably the effective solar radiation. VOL. CVI.-B. V on May 9, 2018 http://rspb.royalsocietypublishing.org/ Downloaded from
* As a n excuse for in tro d u cin g a w o rd w ith a m ixed L a tin a n d G reek d erivation we m a y p o in t o u t t h a t th e m o st a p p ro p ria te G reek prefix " h y p s o " does n o t convey th e m eaning of h eig h t n e a rly so read ily as " a lti-" (cf. " h y p so m e te r" an d " a lti m e te r " ).t I n som e of th e in stru m e n ts th e h y g ro g rap h w as o m itte d ; th ese in stru m en ts were o f sm aller dim ensions.
From October, 1942, to May, 1946, a special investigation of, atmospheric electricity during disturbed weather was undertaken at Kew Observatory, England, with special reference to the electricity carried on rain and snow. The results obtained have been discussed in detail in a paper which is to be published as Geophysical Memoir No. 84 by the London Meteorological Office. Owing to shortage of paper and other difficulties resulting from the war it may be some considerable time before the Memoir is printed and distributed. The Director of the Meteorological Office has therefore approved of the following summary of the conclusions reached in the work being made available in advance of the publication of the Memoir.
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