a) Can,·ae oc.bl1~!;ed. l!.tercture for ouch i\ll•tl:er
lnforoatlon 88 can hE' clC':l~C~t fro~ :)OUnd transmJ.ISS lon 't:etween
source a~d receiver at tho earth's ~urface about vQriatlon ·
of ~o~nd veloeitv anj sound absorption w!th altitude.
Also canvas •eteorolog1cal literatur~ for better 1n.foru5. ti.on
~t.o\lt the st!"2t ottphers.
t) Ase!~n en officor ~c ae~rch confidential
po blicat!ons en fiOUnd raneing nne other rcla ted Sti..bject e
!o!• rele~ant lnfor:DR t1on. 'lhls of'f1cer ehould also collect
data o::J eo·.1n:i r•Ar:61r..e eq_,.:1pment 9nd cerscnncl in tl":c :,:~_ !'!f"!J
.-.hich cc~ll"! ~e lilZ~"O'lll:•led :'or·« n7'oll~i::-:s.ry- tc::!t.
c) ~ake a pro11mi.,.lath ~ollO"!'e-:3 'by ~eh ao·.t!l~ t'9.Y, to tind 1 t~ l':1ghast
•~cent 1nt;~ the· etntonr.here, !'.nd to deter:n1ne the ~oeff1c1ent
of 20~n1 AbBO~t1on.
d) A. study o!" o:tlt\t!ng publications should bemade
to deter:dne the sO.;nd :,roduc~1on of typical rocket .and
"jet PN';)Ul~ion un1tD in orca~ to have data ahout the 1ntons1ty
and the trec;uency d1$tr1but1on of these sources for ultimate
ea~!mate! o! smmd t\hannlll. nngft.
It theGe data Oo not oxist. experiment& should
be ade to ;ll'~uc• them, to~ ~hay would certainly bo ot
usf' in other conneotlons.
. e) An ·~•tifu.to or t.~,e backgl'OUnd noiee to be
ex~cted at tbe axis ot the sound channel ahould be made.
In·., op1n1oii', the J)r1nc1~al contr1butora will 'be meteore,
po'aa1bl~ h1gh-tly1ng- nol'lla·l air tr~~~tt1c, 11ahtn1na,_ md
et1-a1rct'att type artillery t1re. A considerable _body
ot 1nto~~1on could be collected on thle a~bjeet witbo~t
ezpil r1aentat1on.
iEJiJRiT