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MCREOL8/cDG/ jk NEPA Project, P. 0. Box E Oak Ridge, Tennessee 10 February 1949 Mr. G. J. Rathman Chief, Investigation Section Security Division U. S. Atomic Energy Commission P. 0. Box EB Oak Ridge, Tennessee Dear Mr. Rathman This is in response to your letter dated 16 December 1948, subject "Photographs", with inclosures, addressed to Major D. J. Grant at this site, concerning photographs taken during the month of July 1947 by Mr. William Presley of 218 Illinois Avenue, Oak Ridge, Tennessee, of an unidentified object that appeared to be flying over Oak Ridge. Since receipt by Major Grant of the above material, this office has taken steps to secure an evaluation of same by the Air Force office of the Chief, Technical Intelligence Division, Inte1li- gence Department, Air Materiel Command, at Wright-Patterson Air Force Base, Dayton, Ohio. As a result, the following informa- tion has been revealed; “When the negative, containing the sphere, is examined by strong incident light, it is noted that the emulsion is raised at that point above the normal level of the remaining emulsion. This indicates that either a drop of warm water or a drop of developer struck the film at this point and rolled down this negative and the succeed- ing negative. "To further substantiate this, it will be noted that when the two (2) negatives are placed side by side with the edges of the film aligned, the so-called "trail" is con- tinuous, that is the two sections match, indicating the drop rolled on from one negative to the next. "Sill further proof is shown on the fogged edge of the negative containing only the trail. This is proven by the fact that the trail extends beyond the normal format