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An account has already been given of the standardization of photoelectric cells for the measurement of daylight (Poole and Atkins 1935) and of the recording of daylight using a Burt vacuum sodium cell and Cambridge thread recorder (Atkins and Poole 1936). It was shown that the measurements relate to the ultra-violet, violet and blue, but are chiefly an indication of the changes in light of wave-length about 0·41μ , a region in which the eye is of very low sensitivity.

Photo-electric measurements of the seasonal variations in daylight around 0·41 μ , from 1930 to 1937