Abstract
The present writers made observations of the cloud on the day of the total eclipse of the sun, 21st Sept., 1941, by using a photo-theodolite, a whole sky camera and a cinematograph.
The conspicuous phenomena observed were the increase of Alto-cumulus and the decrease of Cumulus as the eclipse proceeded.
Besides these, a figure change of the cloud and the existence of several saturation layers were observed, but any remarkable change in the direction of cloud movement was not.
