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Incident Noe 75 -— 13 August 1947, 1300 hours, Smoke River Canyon, Idaho. A farmer together with his two sons, ten and eight years of aye, witnessed an object move down a canyon. It was in view only momentarily at a distance of 400 feet, and approximately 75 feet above the rround. The object made a swish= o i bad - to vw ing sound, and was sky~blue in color. The farmer doubted the possibility of its visibility if viewed against the sky. The children told of smokeless tur re bine or exhaust flames shooting from tie device through which could be seen daylight. ‘The object passed over some trees, which in the words of the farmer, *spun around on top as if they were in a vacuun." AMC Opinion: It seems logical to concur with Dr. Hynek's deduction, that this object was simply a rapidly moving atmospheric eddy. Declassification Authority: NND 57565