Ultraviolet spectral distribution of radiant energy from the sun

This paper gives the results of some preliminary measurements on the ul traviolet spectral energy distribution of direct solar radiation at Washington , D . C. Data are give n for wave l e ng~hs extending below 300 millimicrons for air masses approximating M = 1.4. T~e ne'y equipment and method employed in this work permit the rapid acquire ment of a prismatic ultraYlOlet sp ec~ral e nergy curve at sea level showing greater Fraunhofer struct ure than prevIOusly obtamed e ven at d esert and mountain stations.