Abstract
An apparatus has been developed which enables the temperature conditions to be studied in a freezer before, during, and after a seeding procedure with an inaccuracy of less than 1 °C. With these means it was possible to fix with a fair degree of accuracy the temperature at the moment of phase transition of the liquid undercooled water droplets to ice and to study the dependence of this temperature on the properties of the seeding substance. An illuminating system suitable for the purpose, an improved method for the fine dispersion of the seeding substances and for the formation of clouds, and finally two carefully tested temperature measuring systems formed the basis for this result. The icing nucleability of altogether 104 different substances in dependency on their crystallographic properties and the special arrangement of their grid elements in the surface have been examined. No distinguished crystallographic influence has been found.
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