they had said earlier they did not trust scaling, then should use two pombs with about the same yleld. Yes, they would prefer this, but mst be opportunists. They have a range built into the pressure-measuring instruments to cover deviations from scaling laws.) Thaler argued further that in a lagoon shot one does not have an infinite medium,a g ization upon which scaling laws are based, but can have channeling, surf e and bottom reflections, etc. He added that they intend to instrunegt{phe of the lagoon shots also, but for another reason (see discussion e roject 1.5). 5 i mend bre more points: the whole contamination problem—for example, the scal¢|work on base surge—-indicates that quite a different effect may occur in deép-and shallow water. Also, if ome conducts an experiment in deep water, dg¥sehtially a homogeneous medium, it is felt one could understand better the, results from a shallow water burst, having done one good experiment whichisanalyzable. Ogle agreed with these points in generel, if they would just do this with a 20-I'T shot (NOT at Castle). Thaler said he has talked with Hartmann and others who feel this 4s a good chance and should not be overlooked; they have confidence in being able to go fron these results to predictions on smaller shots. ih} an ina % Porzel asked if the timé;duration of the pressure wave in the water is important. Thaler replied t it is, frem the point of view of ship damage; the modes of failure completely different if it is given an impulse or squeezed slowly. Por thought this would be so markedly different in a surface and under burst, perhaps by factors of 1000, that ome could not scale with c ce. Thaler did net agree. Porzel elaborated: the phenomenology : ocs on muclear explosions during the time the energy is being tranamitted ito the water is so different in the two cases that the resultant pres wave may well not scale. In nuclear explosions this transmission rgoes a marked transition just about the time one gets down to the pressure leyels which occur in Hi, so that emall charge scaling up to nuclear charges is really treacherous in this domain. Insofar as scaling for big yi ‘in nuclear explosions is concerned, the peak pressures should reasona follow pretty well defined scaling laws, but the durations he was not so sure pf. If peak pressure po trust scaling laws, is of prime interest, then it is a safe enough bet but if the tine constant is important, it is a rousthing to do. The site recammended by the DOD for this shot is p¥£ the southwest corner of Bikini Atoll, about a mile and three cuarters fan the ocean side of Bokororyuru. Thaler has been looking into this and has! found that the old Bikini-Charlie Seabee moorings are still good, will be fan the next thirty years. A tentative mooring system has been worked out relying two lines and a Sea-Hule engine to maintain constant tension ; oean lines. and The Hydrographic Office has furnished information on weve hei a16-