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<br />AIRCRAFT AND SEEDING DEVICES <br /> <br />A variety of materials and techniques has been developed <br />for delivering cloud seeding materials to clouds. In the <br />South Dakota program silver iodide is used as the seE!ding <br />material and aircraft are used to deliver the silver iodide <br />to suitable clouds. <br /> <br />I- <br /> <br />, <br /> <br />AIRCRAFT. . . <br /> <br />Twin engine air- <br />craft, which can <br />fly to altitudes <br />of 20,000 feet, <br />are used to <br />seed clouds. <br /> <br />SEEDING DEVICES... <br /> <br />The liquid fuel <br />generator releases <br />1/4 pound of <br />silver iodide <br />per hour. <br /> <br />The two hail <br />suppression flares <br />at right burn for <br />30 seconds pro- <br />ducing 1/5 pound <br />of silver iodide. <br />The rain increase <br />flares at left <br />produce 1/45 <br />pound in 30 <br />seconds. <br /> <br />" <br /> <br />. '. ~ <br /> <br /> <br />.......... ~'""='_.. <br /> <br /> <br /> <br />17 <br />