Abstract
The Theory of wet and dry bulb hygrometer given by G. I. Taylor at 192_??_, in which he introduced the idea of the eddy-free layer in deriving the hygrometric formula, has now been applied to the phenomena of condensation of dew, and following formula has been derived for the quantity of dew where w g/cm2. min. is the quantity of dew, R cal/cm2. min. the net outward radiation from the surface of a body, t°C air temperature, fmm Hg water-vapour pressure, t°C surface temperature of the body, f'mm Hg the saturated vapour pressure at temperature t' °C, b mm Hg atmospheric pressure and A the constant which has the following m_??_aning where ε means the specific gravity of water-vapour as compared with that of dry air, D the coefficient of diffusion of water-vapour through air, Cv the specific heat of air at constant volume and K the coefficient of temperature conduction. So that the numerical value of A is 2.8. On the other hand if we have the observed value of w, R, t, f', t', f', then from equation (1) we can also determine the value of A experimentally. This also tried, and we got as the numerical value of A, 2.7, which is in good agreement with the theoretical value.
