H-6--72 7. Afi -i.f Rg po 2 5 Since startong oor tn; . prohlem an st sever months ago, a comaiderable part of the time has 2eer spert or ourselwes ir ordar ic oollig ar: de-bdugging, which we undertook l@art ote 2 une fe Model 701, out data, we demmratrate* tha’ .es8 Usdng Brawo fall- 6 uares solutions could be obtained for the various parametri- cuactities inwuivec, However, the "best" values, as selected . % ‘is way, gave iistart “all-out predietions that were only 20 to 30F of the onserve wacuee, an t's attention te Nevads data “o7 a wh. oe that seamed ': We then turned ami becare interested in an approximation Hefore “1a possi: i.ity had been fully explored, dvemmoce (nerat: we worked toget’e our codes tc wea not good. f’e- s hope of eliminating one of the two steps in the double integra. om. M-, Vay shelton "fit" os Tiwiston, joined forces with us, and 7" ° a wees oo UR. anc UR-". Mr. Shelton then took Tivermure and cert tinued wovking on the Nevada data, willie we turned attent.cr agai: tc the Brew that the metro g¢ vee watisfact m contimui.g work or ctter micts wry ar, Shelton has reported recently tes ..te for UR-1 and UK-7, and he is we have cancentrated on the problem of predicting tre Brave fall-ouw. o tre asaumption tnat practically all cf the activity in tie tritda cloud was located above tre tropopause. To date, our method of ca.icuilation has not been at.e to give satisfactory results, even wher the wincs were artditrariiy twisted to maxe the fall-out occur in more nearly tre righ place. not have any cloud mode. &t .°\s point we feel, therefore, that we do tr which we care confidence. We have merely a mechanish of calcu a toi, tee wale «” wict hea rot yet been proven 48 \ : far as Brave {4 > oncerned poder yey J Fn + . | :

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