PROJECT BLUE BOOK

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PROJECT 10073 RECORD CARD
1. DATE 2. LOCATION 12. CONCLUSIONS
21 May 1952 Lambard, Illinois o Was Balloon
0 Probobly Balloon
4. TYPE OF OBSERVATION 0 Possibly Balloon
3. DATE-TIMS GROUP
Local_ 0830 CST Ground-Visual Ground-Rodor. Was Aircraft
Probably Aircraft
GMT Air-Visuol Air-Intercept Rodor Possibly Aircraft
5. PHOTOS 6. SOURCE D Was Astronomical
Yes 0 Probably Astronomical
No Civilian o Possibly Astronomical
7. LENGTH OF OBSERVATION . NUMBER OF OBJECTS 9. COURSE OtherClass marble
00 Insufficient Data for Evaluation
Unknown
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10. BRI AARY OF SIGHTING 111. COMMENTS
wn. Could have been Tar covered glass marble hit sources.
Knowm nobject--origil
shot from slingshot d up by truck etc. mail box and dented it. Marble was
hot. F-86 had just flown over
Shape: Spberical
11

FLYING OBJECT PD ONE SPHERICAL TRANSPARENT GLASS-LIKE OBJ ONE IN IN DIAM
CMA PART COVERED WITH BLACK AND REDDISH MAT RESEMELING TAR OR MACADAM
CMA STRUCK MAIL BOX IN LOMBARD CMA ILL CNA APPROX OE3C HRS CDST 21 MAY
OF HOUSE P IR MINUTES
D DSM SOUTH-
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Flying Object
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Intal 000.9 (31 May 52) lot Ind Haj Grogory/agp/66361
AIR TECHNICAL INTEILDOENCE CRRTER, Wright- Pattarson AFJ, Chio
TO: Commmanding 1706th nal
Alrport, Parl
and baalo lotter, Intell coo. dated 31 May 1o52. Analyals of tho object
A AAE A shows it to bo a Large glass marble covered with a tar-liite subsbance.
It is Lpossible to doternine Its origin, although it is probably
run-ade. About the only conclusione which can he made that the
obhect hod not traveled at any groet spoed for ony distance (ahich would
have melted and ranoved the coating) and that a high velocity oa impact
would either have shattered the glass or drivon it through the mail box
rather than moroly donting it. It is dooned qulte probably that tha
narble uas throwm or slung. Bocause of the foregoing no further investi-
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2.- You
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1 Inel - DONALD L. NOWER
u/d Colonol, USAF
Chiar, Technical Analyois
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UNCLASSIFIED
Mq 4706th Dofense Ving, Intel Co0.9 Subjeo Recovery of Unidontified
Plying Object
6/7/5√
Intel 000.9 (31 1lay 52) Lst Ind Lt Rothstein/vs/54261
Air Technieal Intelligence eterson AFB, Ohio
TO: Commanding Orficer, iq 4706th Deter rational
Airport, Park Ridge, Illinois
Report 4706ul-2-5.
and basle letter, Intel O0o.9 dated 31 llay 1952. +
- glass
narble covered with a tar-like substen ce. The origin of the object or
the coating is unlnowm.
FOR THE COMIANLING OPFICER: .
1 Incl DONALD L. DOVER
w/d Colonel, USAF
Chief, Technieal Analysis idvision
UNCLASSIFIED

UNCLASSIFIED
Hq 4706th Defense I Wing, Intel O00.9 Subje covery of entified
Flying Object
Mkle
(31 May 52) lst Ind A
Intel 000.9
Air Technical Intelligen
TO: Commanding Officer, Hq 4706th Defense rnational
Airport, Park Ridge, Illinois
1. Reference made to your Report lated
and basic letter, In el 000.9 dated 31 May 1952.
2. An analysis of the object shows that the object is a large glass
marble covered with a tar-like subs The origin of the object or
the coating is unknown.
3. It would be possible to determine the energy necessary to dent
the mailbox, as mentioned in the original report, therefore, obtaining
an estimate of how far the marble fell or if it were shot from a slingshot,
etc. However, it is not deemed advisable to do this due to time and financial
factors.
4. Your ed.
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1 Inel DONALD L. BOWER
w/a Colonel, USAF
Chief, Technical Analysis Division
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UNCLASSIFIED
a

DEFENSE WING
O'HARE INTERNATIONAL AIRPORT
PARK RIDGE, ILLINOIS
Intel 000.9 31 May 1952
SUBJECT covery ing Object
TO: Office of the Chief
Air Technical Intelligence Center
Wright-Patterson ce Base
Dayton, Ohio
l. Reference is made to message this headquarters, I
and to Air Intelligence Infor mation Report 4706DW-2-52.
2. Forwarded herewith is unidentified flying object, which was
dt, 159 South Charlotte,
Lombard, I1linois, on 21 May 1952.
3. It would be appreciated if your ren analysis
NTION:
Combat Intelligence Officer.
- FOR THE COMMANDI
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5. Objec beon analyzed nor ested for radio activ IS ity.
6. Neares factor: S
southeast of I
3
7. $ix F-86 INTERIATIONAL AIRPORT, ten
(lo) miles northeast of LomBArD, at the time of the incident. Of these six, two were
on their first flight sincs. their display to the publie on Armed Forces Day. However,
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DOWNGRADED AT & YEAR INTERVALS;
DECLASSIFIED AFTER 12 YEARS
DOD DIR 5200.10 a
INC
NOTE: THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT, 5O U. S. C.—
31 AND 32, AS AMENDED. ITS TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROHIBITED BY LAW.
IT MAY NOT BE REPRODUCED WHOLE OR IN PART. BY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EXCEPT BY PERMISSION OF THE DIRECTOR OF
INTELLIGENCE, USAF.
(CLASSIFICATION) 10 -B5470 OPPICE

DOWNGRADED AT & YEAI: INTERVAL
DECLASSIFIED ANTER 12 YEARS.
DOD DIR 5200.10
0
INCLS.
Center,
Wright-Pat terson Air Base, Dayton, Ohio, under separate ver.
DISTRIBUTION BY ORIGINATOR Colorado rings, Colorado.
1 - Chief, ATIC, Dayton, Ohio
1 DI, Iq USAF, Woshington .D.C.
CG DI, Htewart AF'3
NOTE THIS DOCUMENT CONTAINS INFORMATION AFFECTING NATIONAL DEFENSE OF THE UNITED STATES WITHIN MEANING OF1 THE ESPIONAGE ACT, 50 U. S. C.-
31 AND 32, AS AMENDED. ITS TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROHIBITED*BY LAW.
IT MAYI NOT BE REPRODUCED WHOLE OR IN PART, BY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EXCEPT BY PERMISSION OF THE DIRECTOR OF
INTELLIGENCE. USAF.
UNCLASSIFIED
* U. S. GOVERNMENT PRINTING 9FFICE:19-O-9I833I

SOUND: Unknom
SPEED: Unknon
ALTITUDE: Uninoa .
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HEADING: UnknOM
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SOURCE: Civilian
ACTON oR comENTS: Glass mrble with tar-like covering crigin-unknonn.
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onto porch. Source attempted to pick up objoct but
it·wes too hot. .
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