ACA 4
APT
(oAles
:
carom
.
COLLECTION
BOX No
LHsmus
FOLDER
SEI
Cnetmon (LoSodS
27 Yebruary 1946
BEST COPY AVAILABLE
TO;
Colonel ©. L. Warren, kC, AUS.
FRO: $
Doctor Louis kenjelmenn.
fubject:
Glasses for Visuellcing sest et Operation
CROLEROADL
.
anemone ree oa
1.
Tne follo.in.,; invor.ation woe relayed to ie toaay
from Los Alamos.
&
Tests of the polarcia pleeses incicate:
All except 1/72 of 1% of G1l Light below 4050
Angetroc. unite is ebsorbed.
tron 4050 to 4500 Angwetron units only 1/4 of
1é of tie Li,at cete throu.h.
it it the opinion of optical experts at Los
AlULOS tit Eppreciible umountse wf intre red li bt
eet through polseroic ienses.
be Terets on ell exposea Tilu indicute thet cil
Light beloy 4500 ang: trow units is ubsorbed. howe
ever,
it is thou.ht tnt infre red lieht also ,.ets
throusn this tyse or rilter in upprecizble smounts.
C,.
Lincoin supervisipiiit, len:es, snide #19,
(Lincoln slectric Conpany, Clevelanc, Ohio) i ppeart
to be the oniy sutisfactor;, lasses.
They absorb
99.75% of ultra violet li-nt ond 99.25% of ell intra
rea li.ht.