Abstract
It is frequently observed that in the day time the gradual changes of air temperature in the lower atmosphere are frequently attended by some remarkable, small fluctuations, and these fluctuations occur only in the fine weather under clear sky or under the sky with small amount of cloud. The present author studied these phenomena as observed by means of a bimetallic thermograph made by the Hasegawa Instrument company. As it was observed that these phenomena did not appear in the rainy weather and in the night, they may be attributed to the thermal fluctuations caused by the vortex-like turbulences produced by the insolation.
