= & _ 7 ‘ R ee e¢: fA , \ tA JA 926A ATPBIC ENERCY COMMISSION ri voanton__SNLefallbsgss s 3 1. vA “A “a - Ivy ee. GENERAL 5 ir S. |Fob.I e h ED 7” This supplements my memorandum dated Movember 22, 1952, J-15162, Preliminary Blast Ousmry - Operation Ivy”. 135192 It is concerned vith a mre detailed presentation of the blast data, based on the Sandia results as of + December 15th, rather than their earlier numbers as read in Eniwetok. ‘Two E/oOG BY AUTHORITY OF 2 N % ib excellent between Sandia's oensurements and the purely theoretical predic- tions of LA-1406; there ie also worthwhile evidence of s poesible revision of the KIKE hydrodynamic yield dovavard to 10 t22 megatoas. 2. xim sa BEST COPY AVAILABLE aoENTORIED I The argument for revision of the hytrodynemic yield on MIKE is baseg.. 5 a5iQuns 54 INYENTORIED CLASSIFICATION CANCELLED major conclusions seem to result from these data: (1) ‘he ogreemntis OB Part on he Gagree Of ebiqnse whieh own be attached to the seme Wir 4162 dypemie Gate an 1% was used oa KIND, * Figure 1 shows the time of arrival for KING shot. This excellent agree- nent wae previougly noted because it had been used as a method for checking the actual blast position of KING as determined by Fussell. It is significant here in shoving that the basic tine of arrival curve (and the necessary traneformations through the height of burst curves to correct for the finite height of burst) leads to predicted tines of arrival vhich are “pencil-vidth” correct. Incidentally, note the early tines of arrival over land in comperti- son with both the theoretical prediction end the measured values over water; effect; it is strikingly — this is due to precursor action from the TiS Docs 7°55 OENTRAL Ul : SONTROL wv. ‘ Eat cx