PROJECT BLUE BOOK

UNIDENTIFIED FLYING OBJECT CASE FILES · 1947 – 1969

CASE REFERENCE9617864

DATE OF SIGHTINGNovember 1950

REPORTED LOCATIONSan Francisco Calif

FRAMES7

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Transcribed Frames

FRAME 001 / 007POOR LEGIBILITY — PENDING RE-EXAMINATION

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DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE 5D=O0SI/JEM/ejh
WASHINGTON

THE INSPECTOR GENERAL, USAF
STH DISTRICT OFFICE OF SPECIAL INVESTIGATIONS

DONCLASSIFIED’ AIR FORCE BASE, DAYTON, ONIO
im mercy nerce to: 5D) 24e21 8 November 1950

SUBJECT: UNIDENTIFIED OBJECT
Observed directly overhead San Francisco,
California at approximately 0930 hours,
3 November 1950

TO: Commanding General
Air Materiel Command
Wright-Patterson Air Force Base

Dayton, Ohio
, Attention: MCIS

1. Attached hereto for your information and necessary action are
copies of a letter from the 19th OSI District (IG), subject as above,
dated 3 November 1950, file 19D OSI 24/40 SIR-16.

2. No investigative action is being taken by this office at this
time with regard to above subject.

D1 VCnell_

1 Inel (in dup) JAMES F. X. O'CONNELL .
Ltr, dtd 3 Nov 50 Lt Colonel, USAF
District Commander

ae \
DOWNGRADED AT 3
DECLASSIFIED AF; oogh gd Wey.

DOD DIR 6200.10

NCLASSIFIED

FRAME 003 / 007tesseract-200dpi

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DEPARTMENT OF THE AIR FORCE

HEADQUARTERS UNITED STATES AIR FORCE
WASHINGTON

THE INSPECTOR GENERAL USAF

19th DISTRICT OFFICE OF SPECIAL INVESTIGATIONS

FAIRFIELD-SUISUN AIR FORCE BASE, CALIFORNIA

1M OSI 24/40 SIR-16 3 Novenber 1950

SUBJECPs UNIDENTIFIED OBJECT
Observed directly overhead San Francisco,
California at approximately 0930 hours,
3 November 1950

TO s Director of Special Investigations,
Washington 25, De Ce

| 1. SYNOPSIS: Unusual object observed in sky directly
overhead San Francisco at 0930 hours, 3 November 1950.

Sz On 3 November 1950 Mr.
East Palo Alto, California wae interviewed and stated
that he in company with oight or ten other people observed a bright
object in the sky directly cverhead, At this tine they were working
in the Southern Pacific Freight Yard at 4th and 5th Street to Ting,
San Francisco, California, The object was observed for a period of
twenty (20) to thirty (30) minutes; shape appeared roundg size was
that of a silver dollars colors: whites only one (1) chserved; no
aero dynamic features discernible; no trailer exhaust or propulsion

system observed; it appeared to be suspended in the air; no sound.
approximately 10° accross the sky in the twenty (20) to thirty
30) minute period, No unusual features noticod. Altituie estimted

at 20,000 feet. This was based upon comparison with a medium type
aircraft. Observers were al] railway employees with no previous
aeronautical experience. ,

as ACTICLs Hone.

2 copies to: Commnding General,

G. STORE,

Air Materiel Commmn, colonel, U/F,
Wright-Patterson AFB, District Commander,
Dayton, Obio. \
DOWNGRADED AT 3 YEAR INT? \v
Be," DECLASSIFIED AFTER 12 YEARS \ \
| ' my DOD DIR 5200.10 CH
| . of
j DNCLASSIFIED. y

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FRAME 004 / 007POOR LEGIBILITY — PENDING RE-EXAMINATION

T

Kool | BL f J wf — Set ep He The Toe . Surface Is obtained ‘rom . ae n ue ert—nhe
corner by Crawing @ straicht lire from the point t on the temperature seale
throusm the point o. {meen sea level or station pressure) on the pressure
ceale, and reading the heicht on the height scale.

WOTES: t. Uf the sounding reaches above the 120 mB. level, the top of the

rouncing will be plotted using the pressures indicated in Drackets ( ) alonc

twe Teft-nard marzing This part of tre curve will then de a pressure-tempera—

Ture clot, and not aT, loo p-plot.

“2. This ciagram is in 2?) physical respects equivalent to the TePni-

7" gram. tt differs from the TePni-gram in that the isodars are straight and

. tre dry ipo curved in the former, whereas the isodars are curved anc
he dry—adiabat i cs straiont in the latter.

28 ef: ) Biorb -s:Srbayn fe gtafh 45
Pf (a TERe Oi ter Ca. maleatinmstsncl ge Mei. ae expresed in tre

ters, and z

CXL SLES (YL LA, of geopotential meters. tf fh denctes height in ceopetentia
gon “ RSC 2 derctes seiant in geometric meters, the relation between h and z is, dy defi-
<x EF

CY LYS Y LIAS SL 2 - nitton:
x ZAK CROP RG LDL ia, weal z
RABESS AL ET h,- he ss [ 9 dz
Since «ne meer nuwrical valve of 3 is ete nearly equal to oA msec “2 the

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A Jo/ humidity ere Fommuted by the use of the vasor pressure over ice at tempera-

nae om ata \/ @ ix a KA tures below 0°C. This results in an inflection of these curves at that temer~
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Uj ~ :

pressure surfaces in the |.C.A.¥. atmosphere are written in orackets ( ) de
low the pressures on the left hand side of the diagram,

STATION

ISOTHERMS are the straight, equidistant lines running diagonally from
the left upwards to the rignt.

oORY-aDlagaTICS (i.e. lines of equal potential temperature, or entropy)
are the slightly curved lines running Giagonally from the rignt upwards to the
left.

SATURATED-ADIABATICS (irreversible) are the curved lines that intersect

oF, : - the 1000 md. isobar at intervals of 2°C, diverging upwards and tending to
CY ISL become parallel to the dry-adiadatics. Temperatures of tnese lines are given
4
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7

in °C.

a , -
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ROX i HUMIDITY mixing ratio of saturated air (in om. per kg.) is represented

Sv ¥ . Dy dashed lines. Tneir val appear at the om of t! hart.

IXLZXAIEL AL LIL LI LOL LO Ka dagee gta deansaeoe
SAV x7 ‘y, AY ci RT — THICKNESS (in tens of geopotential mters) of the Inyers Detween tre
; pt Q Af. SLY XL, XL, KS LY levels 1000, 700, 5°00, 300 and 150 mn. fi.e. the levels of the stancard syn—
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FRAME 007 / 007POOR LEGIBILITY — PENDING RE-EXAMINATION

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