Documents / FOIA release
This declassified CIA document, released in 2013, is F. C. Durant's memorandum of 16 February 1953 on the Scientific Advisory Panel on Unidentified Flying Objects. The Office of Scientific Intelligence convened the panel from January 14 to 18, 1953, and Dr. H. P. Robertson chaired it. The memorandum gives a history of the meetings and the members' unofficial comments. The panel found no evidence of a direct threat to national security and rejected the Navy's analysis of the Tremonton film. It recommended an educational program to reduce public concern. The release also contains a later Air Force summary of a 1955 statistical study.
“Charles Fort”1 page
Read from the scan by GLM-OCR; expect the odd misread word.
1000 man-hours of professional and sub-professional time in the preparation of graph plots of individual frames of the film, showing apparent and relative motion of objects and variation in their light intensity. It was the opinion of the P.I.L. representatives that the objects sighted were not birds, balloons or aircraft, were "not reflections because there was no blinking while passing through 60° of arc" and were, therefore, "self-luminous". Plots of motion and variation in light intensity of the objects were displayed. While the Panel Members were impressed by the evident enthusiasm, industry and extent of effort of the P.I.L. team, they could not accept the conclusions reached. Some of the reasons for this were as follows:
a. A semi-spherical object can readily produce a reflection of sunlight without "blinking" through $ 6 0^{\circ} $ of arc travel.
b. Although no data was available on the "albedo" of birds or polyethylene balloons in bright sunlight, the apparent motions, sizes and brightnesses of the objects were considered strongly to suggest birds, particularly after the Panel viewed a short film showing high reflectivity of seagulls in bright sunlight.
c. P.I.L. description of the objects sighted as "circular, bluish-white" in color would be expected in cases of specular reflections of sunlight from convex surfaces where the brilliance of the reflection would obscure other portions of the object.
SECRET Security Information 12 FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 38 pages are in the text index: search them above, or from the library's search.