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<br />Cover Picture This is a sunrise view of a manually actuated cloud <br />nucleant generator. Silver iodide in acetone solution is mixed with <br />propane in the flame-holder and burner, producing along with a little <br />carbon dioxide and water, some trillions of microscopic silver iodide <br />smoke particles per second. The silver iodide is first vaporized, then <br />cooled rapidly, or quenched, as it mixes into the surrounding air. <br />This transforms the vapor into solid smoke particles without going <br />through the liquid state. Storm winds blowing up the mountain slopes <br />are depended upon to distribute these artificial ice nuclei up into the <br />clouds where they transform supercooled liquid cloud droplets into ice <br />particles that grow rapidly, becoming snowflakek that descend to the <br />ground. In many clouds there is a dearth of natural ice nuclei. <br /> <br />~ <br /> <br />.' <br /> <br />., <br />t <br /> <br />PREPARED FOR: DEPARTMENT OF THE INTERIOR <br /> <br />BUREAU OF RECLAMATION <br /> <br />DIVISION OF ATMOSPHERIC WATER <br />RESOURfiES MANAGEMENT <br /> <br />UNDER: CONTRACT NO. 14-06-D-7332 <br /> <br />./ <br />