Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

Text

A machine read this text from the scan. When the text and the image disagree, the image is right.

TABLE A94 EVALUATION OF UNIT SIGHTINGS BY DURATION OF SIGHTING, 1952

Evaluation | 5 SECONDS AND LESS | 6-10 SECONDS | 11-30 SECONDS | 31-60 SECONDS
Number | Per Cent | Number | Per Cent | Number | Per Cent | Number | Per Cent
Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total
0-Balloon | 1 | 5 | 6 | 0.5 | 2.3 | 2.8 | 3 | 3 | 6 | 3.1 | 3.1 | 6.2 | 4 | 7 | 11 | 2.5 | 4.3 | 6.8 | 8 | 10 | 18 | 6.3 | 7.9 | 14.2
1-Astronomical | 86 | 34 | 120 | 39.3 | 15.5 | 54.8 | 26 | 15 | 41 | 26.5 | 15.3 | 41.8 | 23 | 9 | 32 | 14.3 | 5.6 | 19.9 | 10 | 4 | 14 | 7.9 | 3.2 | 11.1
2-Aircraft | 19 | 21 | 40 | 8.7 | 9.6 | 18.3 | 16 | 10 | 26 | 16.3 | 10.2 | 26.5 | 30 | 30 | 60 | 18.6 | 18.6 | 37.2 | 22 | 20 | 42 | 17.5 | 15.9 | 33.4
3-Light Phenom. | 1 | 2 | 3 | 0.5 | 0.9 | 1.4 | 1 | 0 | 1 | 1.0 | 0.0 | 1.0 | 1 | 1 | 2 | 0.6 | 0.6 | 1.2 | 0 | 2 | 2 | 0.0 | 1.6 | 1.6
4-Birds | 1 | 3 | 4 | 0.5 | 1.4 | 1.9 | 0 | 1 | 1 | 0.0 | 1.0 | 1.0 | 1 | 0 | 1 | 0.6 | 0.0 | 0.6 | 3 | 1 | 4 | 2.4 | 0.8 | 3.2
5-Clouds, Dust, etc. | 0 | 1 | 1 | 0.0 | 0.5 | 0.5 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0 | 2 | 2 | 0.0 | 1.2 | 1.2 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0
6-Insuffic. Info. | 11 | 0 | 11 | 5.0 | 0.0 | 5.0 | 6 | 0 | 6 | 6.1 | 0.0 | 6.1 | 11 | 0 | 11 | 6.8 | 0.0 | 6.8 | 9 | 0 | 9 | 7.1 | 0.0 | 7.1
7-Psychological | 2 | 0 | 2 | 0.9 | 0.0 | 0.9 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 5 | 1 | 6 | 3.1 | 0.6 | 3.7 | 2 | 0 | 2 | 1.6 | 0.0 | 1.6
8-Unknown | 22 | 0 | 22 | 10.0 | 0.0 | 10.0 | 16 | 0 | 16 | 16.3 | 0.0 | 16.3 | 27 | 0 | 27 | 16.8 | 0.0 | 16.8 | 32 | 0 | 32 | 25.4 | 0.0 | 25.4
9-Other | 8 | 2 | 10 | 3.7 | 0.9 | 4.6 | 1 | 0 | 1 | 1.0 | 0.0 | 1.0 | 4 | 5 | 9 | 2.5 | 3.1 | 5.6 | 1 | 2 | 3 | 0.8 | 1.6 | 2.4
Total | 151 | 68 | 219 | 68.9 | 31.1 | 100. | 69 | 29 | 98 | 70.4 | 29.6 | 100. | 106 | 55 | 161 | 65.8 | 34.2 | 100. | 87 | 39 | 126 | 69.0 | 31.0 | 100.

Evaluation | 61 SECONDS - 5 MINUTES | 6-30 MINUTES | OVER 30 MINUTES | NOT STATED
Number | Per Cent | Number | Per Cent | Number | Per Cent | Number | Per Cent
Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total
0-Balloon | 40 | 36 | 76 | 13.2 | 11.9 | 25.1 | 53 | 37 | 90 | 16.8 | 11.7 | 28.5 | 25 | 12 | 37 | 16.1 | 7.7 | 23.8 | 31 | 20 | 51 | 9.0 | 5.8 | 14.8
1-Astronomical | 3 | 7 | 10 | 1.0 | 2.3 | 3.3 | 22 | 14 | 36 | 7.0 | 4.4 | 11.4 | 23 | 13 | 36 | 14.8 | 8.4 | 23.2 | 46 | 13 | 59 | 13.4 | 3.8 | 17.2
2-Aircraft | 43 | 50 | 93 | 14.2 | 16.5 | 30.7 | 31 | 33 | 64 | 9.8 | 10.4 | 20.2 | 8 | 7 | 15 | 5.2 | 4.5 | 9.7 | 42 | 27 | 69 | 12.2 | 7.8 | 20.0
3-Light Phenom. | 6 | 3 | 9 | 2.0 | 1.0 | 3.0 | 13 | 6 | 19 | 4.1 | 1.9 | 6.0 | 1 | 2 | 3 | 0.6 | 1.3 | 1.9 | 3 | 1 | 4 | 0.9 | 0.3 | 1.2
4-Birds | 1 | 0 | 1 | 0.3 | 0.0 | 0.3 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 2 | 0 | 2 | 1.3 | 0.0 | 1.3 | 1 | 0 | 1 | 0.3 | 0.0 | 0.3
5-Clouds, Dust, etc. | 0 | 3 | 3 | 0.0 | 1.0 | 1.0 | 1 | 1 | 2 | 0.3 | 0.3 | 0.6 | 1 | 0 | 1 | 0.6 | 0.0 | 0.6 | 1 | 0 | 1 | 0.3 | 0.0 | 0.3
6-Insuffic. Info. | 18 | 0 | 18 | 5.9 | 0.0 | 5.9 | 27 | 0 | 27 | 8.5 | 0.0 | 8.5 | 7 | 0 | 7 | 4.5 | 0.0 | 4.5 | 70 | 0 |  | 20.3 | 0.0 | 20.3
7-Psychological | 4 | 3 | 7 | 1.3 | 1.0 | 2.3 | 7 | 0 | 7 | 2.2 | 0.0 | 2.2 | 4 | 1 | 5 | 2.6 | 0.6 | 3.2 | 2 | 1 | 3 | 0. | 0. | 0.9
8-Unknown | 77 | 0 | 77 | 25.4 | 0.0 | 25.4 | 58 | 0 | 58 | 18.4 | 0.0 | 18.4 | 39 | 0 | 39 | 25.2 | 0.0 | 25.2 | 73 | 0 | 73 | 21.2 | 0.0 | 21.2
9-Other | 9 | 0 | 9 | 3.0 | 0.0 | 3.0 | 10 | 3 | 13 | 3.2 | 0.9 | 4.1 | 7 | 3 | 10 | 4.5 | 1.9 | 6.4 | 12 | 1 | 13 | 3.5 | 0.3 | 3.8
Total | 201 | 102 | 303 | 66.3 | 33.7 | 100. | 222 | 94 | 316 | 70.3 | 29.7 | 100. | 117 | 38 | 155 | 75.5 | 24.5 | 100. | 281 | 63 | 344 | 81.7 | 18.3 | 100.

160