Documents / Report
This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.
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CODE 50 SHAPE PARAMETER a/b CODE 51 SUBTENDED VISUAL ANGLE (Referred to sun diameter) X - Variable Y 0 - 0 . 0 1 - 0.05 2 - 0.1 3 - 0,2 4 - 0.3 5 - 0.5 6 - 0.75 7 - 0.9 8 - 1.0 9 - Other CODE £2 LIGHT BRIGHTNESS X - Decreased in size Y 0 - 0.1 1 - 0.2 2 - 0.5 3 - 0.75 4 - 1.0 5 - 1.5 6 - 2.0 7 - 4.0 8 - 4.0 to 10.0 9 - Other (Intensity) CODE 53 ANGULAR VELOCITY X Decreased Y 0 Sunlight on mirror 1 Sunlight on aluminun 2 Sunlight on plaster 3 Sunlight on stone 4 Sunlight on soil 5 Brighter than moon 6 Like noon 7 Duller than moon 8 Barely visible 9 Other X Variable Y 0 Zero 1 Very slow, 1° per second 2 Slow, 3° per second 3 Moderate, 6° per second 4 Rapid, 12° per second 5 Very fast, 30° per second 6 Extremely fast, 90© per second 7 More than 90° per second 8 9 Other CODE 54 ANGULAR ACCELERATION (Change in Angular Velocity) CODE 55 APPEARANCE BEARING X Variable Y 0 Zero, V=constant 1 Increasing slowly 2 Decreasing slowly 3 Increasing fast 4 Decreasing fast 5 Increasing very fast 6 Decreasing very fast 7 8 9 X Y 0 - N 1 - NE 2 - E 3 - SE 4 - S 5 - SW 6 - W 7 - NW 8 9 293 •''A L
Report, cited by the archive. The PDF is mirrored here; the original link is under it. 309 pages are in the text index: search them above, or from the library's search.