Abstract
The more comprehensive classification of plane type crystal of snow is proposed and the external conditions favourable for the development of each of the types are studied. The experiments were carried out, as the previous work, with the room temperature ranging between -20°C and -30°C in the cold chamber of the Low Temperature Laboratory. The results are given In Ta-Tw diagram and it was found that, besides the rate of supply of water vapour, the temperature of the air where the crystal is made has a strong influence on the mode of cr stat development.
