Many supercooled water-droplets were frozen on a cooling brass plate to find the effects of artificial rainmaking. The water-droplets were contaminated with silver iodide smoke and some soil and mineral powder. As shown in Tables 1 and 2 the freezing temperature was found for each contaminated substance. Freezing temperature of melted snow crystals was observed.
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Hama et al. (1956) studied this question.
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