Abstract
The blocking-layer photocell, having several advantages, has recently become noticed as applicable in meteorological works. With “Mazda” selenium photocell, we have made a trial measurement of the distribution of sky-light Difficulty arising from the fatigue was scarcely found when the light falling upon the cell was suitably limited. We obtained among others some noteworthy results, that (1) magnitude an distribution of brightness near the sun for the cloudless, but very turbid sky due to the “yellow dust” quite resembles to that for the overcast sky with thin CS cloud; (2) “Isophoten” near the sun is quite circular in comparison with somewhat elliptic observed by C. Dorno
