UAP Reported at Sandia Base, 1948-1950

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Attention is called particularly to the l arao !lumber ot small particles in one
at the 145-l/2-ho-.ir collootione.
The actual nl.I!lber in the colle'ltion was 140, tor
the r ive-oinute run.
l.!ost of these l'lere in the size range of' tTJO to f1ve microns•
and the principal difficulty in assoctattnc them 111 th the fireball is that a five­
micron par\1cle cannot tall J!lUOh more tho.n l0,000 foot in 145. 5 hom-s.
These part1­
olea could have ccr:ie down from a greater height only it' sol:!& downward motion hfld
tc.k:en place in port of the a1r 1nvolvet.
It should be oantioned. that collections were t aken during tbe at'ternoon of Ju13'
27, at several pointa eouth end east ot Socorro, tbs fartb.eot being near Binche:a.
These oolleotions ocntainod pcrtiole~ giving copper indications, the :particles being
i n tho •a;?¥!) range ot sizes as those collected in Socorro at about the &a.":le ti'C'.b.
It is perhaps noteworthy that the cop_per-boari ng particles 1n all these collec­
tlona were of opaque material.
I.oat ot the co:;,per minerals tbat h uve previously-
come to our attention 1n collection• rrom the air have been oolored material, blue,
green, red, or yellow.
C OBALT
AND
NICKEL TESTS
In the 2 t00 J.l•
coll~cti on of J"ul.y 26, three quite re:::iarkable particles were
found that save very strong coba1t indications.
The particles were apparently por­
:reot spheres (at l east thoy were pori'eetly circul.ar in cross section), twelve mic­
ro!ls in diameter.
The reaction with rubeanie e.eid, after at!nOnia trentmant , pi•o­
dueed a dense yellow-ten halo, eixty microns 1n diameter.
The color v.ao not quite
so clear es with pure cobalt:
the e.ppearance sU;;gestin.g e. high-cobalt com,vosition
with so~ metal. prosont.
Such particles are quite uniqne i n the axporionce or the
present. , It' these particles wore of meteoritic orictn they cwld, in tho absence
of verticul oir IJOV«llSnt, have f'al:len a d1stO!loo of the oi·der ot 20, 000 feet 1n an
i nterval or 41. 5 houra.
Two particlse giT1ns nickel indication.swore round. ~a is quite nomvl, llo ,­
ever.
It anything, the number is smaller than x::ight have been expected in material
of aurt'aoe ori<;in.
The collections ware not given acid treatnent: additional nickel
indieations might h &Te been 'i'ound it t his had been done.
A
oUOGEB TION
hile the r&aul.ta o!' the present investiga:Uou ahould be recarded as negatt-vo
or,inoonolusive, it i s desired to call attention to the faet that a coan.s ia at hand
that obould r..al:a .PQAsiblo a definite demonetration of tho presence or absonoe ot cop­
per :particl es asaod.ated with events or the July 24th type.
rartlo l.e collectlon equipment, operating on the s .:mie principle as that used in
the i:resont inTestigat1on, and der;igned tor airple::ie installation, is on hand and
1te suco&esful operation has been dooonstrated in numeroll s sligh:ta.
Provision
NND 58378