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.
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
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.