DOW-UAP-D017_General_Correspondence_Of_Sandia.pdf

This document consists of 2 pages, copy 1 of 4, series H.

SECRET

HEADQUARTERS, DETACHMENT D
1100TH USAF SPECIAL REPORTING GROUP
Campbell Air Force Base
Camp Campbell, Kentucky

7 April 1949

333.1
SUBJECT: Security Inspection

TO: Commanding General
Sandia Base
Albuquerque, New Mexico

1. Reference is made to secret letter, your headquarters, dated 1 April 1949, Subject: Security Inspection.

2. a. Guard Orders have been amended directing that the electric gate be closed between 1700 hours until 0700 hours the following day.
b. Locks have replaced the bolts in all inspection access gates in …

This document consists of 2 pages, copy 1 of which is a series 4
7 April 1949

SUBJECT: Security Inspection

2. Cont'd.

g. Pressure has been exerted to get the Post Engineers to keep the drainage system clear and to take measures to check the erosion. These efforts will be continued but little progress on erosion control can be expected until the rains diminish. Ditches have been filled, dirt moved and replaced, native grasses planted, but the rains return too soon and much of the effort invested is therefore wasted. Plans are prepared for an interim erosion control effort, and a study is bei…

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HEADQUARTERS
SANDIA BASE
Albuquerque, New Mexico

Reviewed-
DF 21 Jan 62

AFSWP
CLASSIFIED DOCUMENTS LIBRARY

1949

FILE NO. 333.5
SUBJECT: Unidentified Flying Objects

SECRET
NND 58378

38001
333.5
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RESEARCH AND DEVELOPMENT DIVISION - NEW MEXICO SCHOOL OF MINES - SOCORRO, NEW MEXICO
10 August 1949

Dr. Lincoln LaPaz
Institute of Meteoritics
University of New Mexico
Albuquerque, N. M.

Dear Lincoln:

I am inclosing two copies of the report you asked for, and hope that they serve their purpose.

We have made a preliminary examination of the eighteen collections taken at nine locations on my Monday-Tuesday trip. There was a large number of copper-bearing particles on one collection (R-104L) taken on Highway 84, seventeen miles north of Highway 66, and scattered occasional …

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R/D-tw
8-10-49

AN ATTEMPT TO COLLECT AIRBORNE PARTICLES
ASSOCIATED WITH THE FIREBALL OF JULY 24, 1949

By
W. D. Crozier
and
Ben K. Seely
NEW MEXICO SCHOOL OF MINES

M E T H O D

A fireball was reported to have passed over the general neighborhood of Socorro, New Mexico, at 8:26 p.m., July 24, 1949. Impactment equipment, developed in connection with the aerosol research project of the New Mexico School of Mines, was available, and it was decided to make systematic collections of airborne material in the hope of obtaining material that could be associated with the fireball. For the prese…

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dimension of the order of twenty or thirty microns. There were no small particles, that is, no particles with a maximum dimension below 15 microns.

Following the first collection, additional collections were made, under similar conditions, over a period of eight days.

The accompanying table summarizes the conditions and copper counts for all these collections, including the first one described above. A number of the runs were for periods longer than three minutes, but the counts have, in these cases, been reduced to the three-minute equivalent. One collection showing several l…

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TABLE

Counts of Copper Particles in Collections at Socorro
During Period July 25 to August 1, 1949
= (Reduced to Particles per 102 Liters of Air)

|  Collec.Time Date | Hour | Elapsed time | Wind* Direction knots | Copper Counts  |   |   |
| --- | --- | --- | --- | --- | --- | --- |
|   |  |  |  | 1 - 15 Micron Range | 15 - 30 Micron Range | 30 Microns  |
|  7-25 | 10 AM | 13.5 | NNW - 9 | 1 | 4 | 1  |
|   | " | 13.5 | " | 0 | 2 | 2  |
|  7-25 | 2 PM | 17.5 | ? ? | 4 | 1 | 1  |
|   | " | " | ? ? | 1 | 0 | 0  |
|  7-26 | 8 AM | 35.5 | W? - 9 | 8 | 0 | 0  |
|   | " | " | " | 20 | 0 | 0 …

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Attention is called particularly to the large number of small particles in one
of the 145-1/2-hour collections. The actual number in the collection was 140, for
the five-minute run. Most of these were in the size range of two to five microns,
and the principal difficulty in associating them with the fireball is that a five-
micron particle cannot fall much more than 10,000 feet in 145.5 hours. These particles
could have come down from a greater height only if some downward motion had
taken place in part of the air involved.

It should be mentioned that collections were taken dur…