Documents / FOIA release
This CIA-released copy of Project Blue Book Special Report No. 14 is dated 5 May 1955 and comes from the Air Technical Intelligence Center at Wright-Patterson Air Force Base. It is a statistical analysis of about 4,000 unidentified aerial object reports from 1947 through 1952, coded onto IBM punched cards with the help of a panel of scientists. The report concludes that such objects were highly unlikely to be technological developments beyond present-day scientific knowledge. It also found no valid evidence of physical matter.
## CODE 50 SHAPE PARAMETER a/b
$$
0 - 0. 0
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$$
1 - 0. 0 5
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$$
2 - 0. 1
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$$
3 - 0. 2
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$$
4 - 0. 3
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$$
5 - 0. 5
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$$
6 - 0. 7 5
$$
## CODE 51 SUBTENDED VISUAL ANGLE (Referred to sun diameter)
$$
1 - 0. 2
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$$
2 - 0. 5
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$$
3 - 0. 7 5
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$$
4 - 1. 0
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$$
5 - 1. 5
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8-4.0 to 10.0
9- Other
## CODE 52 LIGHT BRIGHTNESS (Intensity)
## CODE 53 ANGULAR VELOCITY
X Variable
Y
0 Zero
1 Very slow, $ 1^{\circ} $ per second
2 Slow, $ 3^{\circ} $ per second
3 Moderate, $ 6^{\circ} $ per second
4 Rapid, $ 12^{\circ} $ per second
5 Very fast, $ 30^{\circ} $ per second
6 Extremely fast, $ 90^{\circ} $ per second
7 More than $ 90^{\circ} $ per second
8
9 Other
## CODE 54 ANGULAR ACCELERATION (Change in Angular Velocity)
## CODE 55 APPEARANCE BEARING
X Variable X
Y Y
0 Zero, V=constant 0-N
1 Increasing slowly 1-NE
2 Decreasing slowly 2-E
3 Increasing fast 3-SE
4 Decreasing fast 4-S
5 Increasing very fast 5-SW
6 Decreasing very fast 6-W
7 7-NW
8 8
9 9 FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 312 pages are in the text index: search them above, or from the library's search.