Distribution of temperature and vapour pressure in the neighbourhood of a water-surface

The present paper describes the results of experiments made in the laboratory to determine the distribution of temperature and vapour pressure in the neighbourhood of an evaporating water-surface with wind speeds varying from 0 to 2 1/2 metres per second. Fine dry and wet thermo-couples were used to determine the temperatures. It was noticed that when the watersurface was warmer than air, there were conspicuous fluctuations of temperature above the water-surface, the maximum fluctuations being at a height of about 1 cm. above the surface. A table is given showing the heights above the surface at which the temperature and vapour pressure changes amounted to one-half the total changes.