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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 72 Original source ↗

“meteor”15 pages

  • p. 9 …for as misinterpretations of known objects (suchas meteors, balloons, or aircraft), a few as the result…
  • p. 19 …Balloons, aircraft, astronomical bodies (such as meteors), birds, and clouds or dust were recognized as major…
  • p. 44 …mph More than 4 0 0 mph Meteor-like Not stated Unknown Per Cent 15 20…
  • p. 46 …i r 00 Elliptical Rocket and aircraft Meteor or comet Lenticular, conical or teardrop Flame Other…
  • p. 72 …434 434 Shape Elliptical Rocket and aircraft Meteor or comet Teardrop, lenticular, or conical Flame Other…
  • p. 74 …100 to 400 mph Over 400 mph Meteor-like Not stated 249 154 181 403'" 8…
  • p. 76 …There is a higher percentage of KNOWNS in the flame and in the meteor- or comet…
  • p. 80 …OF SHAPE Shape Elliptical Rocket or aircraft Meteor or comet Flame T e a r d…
  • p. 82 TABLE XII Speed Stationary Less than 100 mph 100 to 400 mph Over 400 mph Meteor…
  • p. 84 …The second was slightly increased by the removal of the astro- nomical sightings from the meteor…
  • p. 108 …Evaluation of All Sightings for All Years by Shape of Object, Meteor or Comet . . . . . . . 190 Table…
  • p. 109 …Evalua^on of Unit Sightings for All Years by Shape of Object, Meteor or Comet 194…
  • p. 110 …Evaluation of Object Sightings for All Years by Reported Speeds of Objects, Meteor-Like Speeds 209…
  • p. 291 …Meteor like Not stated Other CODE X Y 0 1 2 3 4 5 6 7…
  • p. 302 …100 - UOO mph More than iiOO mph Meteor-like Not stated Other CODE 63 SHAPE X…
TABLE IV CHI SQUARE TEST OF KNOWNS VERSUS
UNKNOWNS ON THE BASIS OF SHAPE
Total 1765 434 434
Shape
Elliptical
Rocket and aircraft
Meteor or comet
Teardrop, lenticular,
or conical
Flame
Other
Not stated
Number of
KNOWNS
838"
80
55
103
96
193
400
Adjusted
Number of
KNOWNS (K)
206
20
14
25
24
47
98
Number of
UNKNOWNS (n)
195"
33
4
22
10
54
116
X2,
(K-n)2
K
0. 59
8.45
7. 14
0.36
8. 17
1.04
3.30
29.05
D e g r e e s of f r e e d o m
5%
1%
12.6
16.8
64

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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.