Documents / Analysis
Special Report No. 14 was issued by the U.S. Air Force's Air Technical Intelligence Center on 5 May 1955. It is a statistical study of about 4,000 reports of unidentified aerial objects from June 1947 to December 1952. The reports were reduced to IBM punched cards and analyzed with methods including chi square tests. The report concludes that the reports it examined are very unlikely to represent technology beyond present scientific knowledge, and it notes that no case produced valid physical evidence.
“US Navy”1 page
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
Analysis, from the classic collection. 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.