Project Sign Progress Report, 1948

eCONFIDENTIAL •
Identit1c&tlon ot Subjeot llatter (a, per ••Pl•)
IIOU 11CIT 19 Feb 48 l
l. Reterenoe 1a ade to th• £11&1 tann b7 llr. Rhoad•• (In.oident f,40) which
••re tonrarded tor exuination. Tb• tollcnriq data ••r• dtri·Hd. froa a atucly ot
the 1peciaen1
a. It ia oonoludecl that th• me• ii of tne pbotogn.phio m.ture, and
1• not due to 1~rteotion1 in th• nul.S.011. or lack o1 deTel opaent in the ■ to
tion in quHtion. Th• im.c• •xhibit1 a "tt.11" indicating th• pn,per t)'~ ot
di1to·rtion due to the tne ot 1hutter u1ed, tht apt.cl of the o'bj•ot and tht
fixed •peed. of the abutter. Thll trailing ott oontona, to th• g.ntral intor••
tS.oD giT~ 1n th• report.
l>. Th• nport 1tatH th• objeot na •••n a.1- approxiat•ly 2000 t••t
at tho ti• ot expoaure. !he obaerHl" allO report, bein& abl• to Ht oltarl1
t. oanow of •nolo1v•. !h• Tiaual aouity ot an aTerag• perao!lf'woulcl allow tor
thi• peroeptioa, bu't oH•te:l Illy not auoh t'\ll'ther •• 'the 1ubjeot Md low fl nal
ooutraat, being cn.y againat a C!'&T •~• It•• ou e1tabl1ah the 41,teoe troe
o&aora ~o 1ubjeot, •• Will h&Te quntlty ,fl. !he report 1tate1 tha.t a 820 oaatrt.
n.1 u,.ct, in4ioat1ng Hnn.l po111Mlli1••• ti.not tht 620 ia ooa111cle.tur• for the
•pe>oli~ a.114 width ot the til.a •• aay h&Ye mptiT•I 2t' X 2t", 2f X ~ a.n4
2-t x 4f'. The aaapl• aubaitte4 ha.cl been out and it wa1 not po11ible to Ht&blilh
the 1xaot traat dse. !be 2t x 2f' Iii• waa rul•d out, 1-anrc 2¼ x st" a.nd
i¼ x ~. It 1 t ftre th• ro,...r, them. the tooal leqtii ot the 101 would be •••
an4 uelisg 2000 teet ... the approid.u.te aubj•ot diatanoe and the lagt dH at
1/M•, .. ban an app,onaat• ••se ot '4 t••• a, the cllagonal of the objeot.
low 1t wa ohoo ■• the latter n.lue ot a• tor t.,eal length, •• h&Te an approxi•
•te T&lue ot' &&• tor th• cliagon&l. Poln-t:1 ot meaauNaent are 1ndioated troa .
x to x on lxhibit ••••
CONFIDENTIALNND 927545