Documents / Report

Project Blue Book Special Report (second copy)

Internet Archive · 309 pages · text from the file's own layer

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.

Open the PDF at page 75 Original source ↗

“multiple objects”5 pages

  • p. 17 …Therefore, a designation of OBJECT SIGHTINGS was established, with the following definition: OBJECT SIGHTING - (1) The…
  • p. 18 …An example was the finding of the approxi- mate angular velocity and acceleration of the object…
  • p. 23 …the reported color of the objects, because of the multiplicity of reports on some of the…
  • p. 76 …a greater proportion of UNKNOWNS in the multiple object classification. Apparently these are harder to identify…
  • p. 299 …Unit sightings, single observers Unit sightings, multiple observers Object sightings X Y 0 1 2 3…
TABLE VII CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS
ON THE BASIS OF LIGHT BRIGHTNESS
Light Brightness
Number of
KNOWNS
Adjusted
Number of Number of
KNOWNS (K) UNKNOWNS (n)
Sunlight on mirror
Sunlight on aluminum
Sunlight on plaster,
stone, or soil
Brighter than moon
Like moon or duller
than moon
Not stated
Total
47
151
76
27 3-
68
-
1150
1765
11
37
19
67
17
283
434
14
28
16
61
22
293
434
X
(K-
K
0.
2.
0.
0.
1.
0.
5.
2
»n ) 2
82
19
4 7
55
4 7
3 5
8 5
Degrees of freedom
5% 11. 1
15. 1
67

Cited by

Cases discussed

About this file

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.