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this period except that in September 1939 the Richard recording millivoltmeter used in conjunction with the Eppley pyrheliometer for the continuous measurement of total radiation on a horizontal plane was replaced by a Leeds and Northrup recording potentiometer. For the most part, measurements of solar radiation at normal incidence and its spectral distribution-ultra-violet, luminous and infra-red-were made at 10 a. m., 12 in. and 2 p. m. on days when the sun was unobscured by clouds or haze. Measurements were also made at the same times of the spectral distribution of the total radiation, direct and diffuse, and of the diffuse sky radiation only, as received on a horizontal surface. Spectrograms to show the short-wave-length limit of the spectrum were also taken at these times. The determinations for 1931 were made from a tower about 40 feet above sea level built on the roof of a small building adjacent to the lakorato ;

SUMMARY OF THE INTENSITY AND SPECTRAL DISTRIBUTION OF SOLAR RADIATION AT NEW ORLEANS 1931–40, INCLUSIVE