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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 74 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 VI CHI SQUARE TEST OF KNOWNS VERSUS
UNKNOWNS ON THE BASIS OF SPEED
Speed
Number of
KNOWNS
Adjusted
Number of
KNOWNS (K)
Number of (K-n)Z
UNKNOWNS (n) K
Stationary
L e s s than 100 mph
100 to 400 mph
Over 400 mph
Meteor-like
Not stated
249
154
181
403'"
8 3
695
61
38
4 5
99
20
171
Total 1765 434
53
26
58
145 "
16
136
434
1.05
3.79
3.76
21.37
0.80
7. 16
37. 93
Degrees of freedom
5%
1%
11.1
15. 1
66

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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.