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.
“multiple objects”5 pages
CODE 59 LIGHT COLOR X Variable Y 0 White 1 Black 2 Grey 3 Red k Orange 5 Yellow 6 Green . 7 Blue 8 Violet 9 Other CODE '60 COLOR GROUP CLASSIFICATION X Light glow Y 0 White 1 Metallic 2 Red 3 Orange k Yellow 5 Green 6 Blue 7 Violet 8 Black 9 Other CODE 61 NUMBER X Y 0 1 2 3 h 5 6 7 8 9 1 CVJ 3 U 5 6 7 -10 11-20 21-30 31 or more CODE 62 SPEED Variable Hovering, stationary Less than 100 mph 100 - UOO mph More than iiOO mph Meteor-like Not stated Other CODE 63 SHAPE X Variable Y 0 Ellipse 1 Rocket 2 Conventional a i r c r a f t 3 Unconventional a i r c r a f t U Meteor, comet 5> Lenticular 6 Conical 7 Teardrop 8 Flame, tails, fire 9 Fire CODE 6k SUBTENDED VISUAL ANGLE (Referred to sun diameter) f X Y 0 1 2 3 k Decreased in size 0.1 0.2 0.5 0.75 1.0 if 5 6 2.0 7 U.O 8 U.O to 10.0 9 Other CODE 65 LIGHT BRIGHTNESS ( I n t e n s i t y ) X Decreased Y 0 Sunlight on mirror 1 Sunlight on aluminum 2 Sunlight on plaster 3 Sunlight on stone U Sunlight on soil 5 Brighter than moon 6 Like moon 7 Duller than moon 8 Barely visible 9 Other CODE 66 ANGULAR VELOCITY X Variable Y 0 Zero 1 Very slow, 1° per second 2 Slow, 3° per second 3 Moderate, 6° per second k Rapid, 12° per second 5 Very fast, 30° second 6 Extremely fast, 90° per second 7 More than 90° per second 8 9 Other 306
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.