Photoelectric measurements of the seasonal variations in daylight at Plymouth, from 1938 to March 1941, compared with the years 1930 to 1937

Abstract
The objects of this paper are: (1) to reconsider the methods used in the light of experience extending over more than eleven years; (2) to present the observations made since 1937 and to compare them with those already published; (3) to consider the observations on illumination in relation to those ordinarily recorded by the Meteorological Office for sunshine, cloud, rainfall, etc.; (4) to compare the variations found with those obtainable from the examination of records made elsewhere.
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