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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.

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