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<br />I, <br /> <br />responsibility for the development of the particular spray system which <br />FTR borrowed from Edwards AFB. <br /> <br />The FTR hygroscopic material seeding program in Oklahoma was con- <br />sidered as an operational effort, to utilize the best available knowledge <br />and technology in this subject. The program setup would have been <br />considerably different and the program would have to have been far <br />larger, if it were a research effort. In particular, the seeding was done <br />according to our best judgement of how to maximize precipitation, not <br />how to make the evaluation of results easy. The hygroscopic seeding is <br />based on a very simple and proven concept - - that small liquid particles <br />released where they will move through a cloud environment will grow by <br />coalescence with cloud droplets and emerge from the cloud as larger <br />precipitation particles. If we are releasing the right sort of particles <br />into the right conditions, we cart be confident of causing some beneficial <br />effects even if the simultaneous presence of natural rainfall masks the <br />results. In spite of the operational emphasis to the program, of course <br />we have tried to derive some research knowledge and evaluations of <br />results whenever possible. However, no definite conclusions as to <br />results can be drawn. <br /> <br />This report describes the project setup, equipment, and major events. <br />It also goes briefly into the conceptual design of hygroscopic material <br />seeding, and how such seeding relates to the more conventional ice <br />nuclei seeding. It comments on future programs having both operational <br />and research phases. <br /> <br />The field notes and daily plots of flights are given in a <br />second volume. <br /> <br />.. <br /> <br />Ie- <br /> <br />2 <br />