Tables are given of the observed relative solar energy distribution for zero air mass in the wavelength interval 10,()()( 25,000 A. The observations are based on measures made at Mount Wilson at the Snow telescope with resolution-band pass 0.30 A. The calibration of the spectral response of the equlpment was evaluated by observations of a black-body source and a pyrometric arc. A detailed description of the comparison sources and their use is given.
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A. Keith Pierce (1954) studied this question.