Abstract
In this paper is descrideed a new thermodynamic diagram, which is specially convenient for the routine work of weather forecasting. The abscissa is equivalent potential temperature, and the ordinate the barometric pressure. There are drawn such lines as temperature, maximum mixing ratio, dry-adiabatic and height. This diagram is more convenient compared with those hitherto used, as observed temperaiure ect. are represented by the curves standing almost vertically, and therefore the conditions of the upper atmosphere can be easily seen.
