. 108.1 sn greonare ca Wey trom an erigioa 0.36 pet Gs a aprend betieen 6 and .66 pei and in view of the difference in damage on Parry from the two shota. Even allowing for the slow rise tine on MIXK, this revision is dif- AeatSE ed ficult to understand in with the 0.33 psi for KING; on the other more consistent with hand, it ig theoretical predictions for a homogeneous medium. The inter- mediate stations have changed very slightly froa the original nuabers. Howevey, the downard revision at close-in and the upward revision far out result in reducing the apparent magnitude of the atmospheric inhomogensity. Wheyeas the Parry meaguvements indicated that the pressures vould extrapolate to ideal values short of 15,000 feet, the present data would indicate that the peak pressures are low for 12 megatons even at close-in distances. The results are not clear-cut vithout further study because of the interference of surface effects. Figure 6 shows the positive duretion for MIKE shot. Here again one notes the abooxmalily long positive durations at almost all distances, which ts at- tributed to atmospheric inhowogeneity and reinforcement of the blast wave by thermal rediation. ». comciusrons BEST COPY AVAILABLE Ia general, the agreement of these measured data with the purely theoretical predictions af LA-1N06 is significant in showing thet basic field variables ere well understood, theoretically and experimentally, Tn view af the possible revision of the fireball data downward ani the hydrodynamic date on MIKE, 1¢ is recommended thatfor the time being the hydrodynamic yield be quoted somewhat lover then before - perhaps as "10 to 12” wagatons, instesa of 12 / 1.