ay A note of special interest is thet some indication of the fireball size as a function of yield is found in » compsrison of the ERT data of 2ae een rerates = e burns f 1'd.d. were produced the present shot Lerg by exposure to the FA «t Runit __ At essentially the same distance, much smaller lesions averaging only 1/4 dyd. were produced at Japtan by the near : nominal weapon, At this distance the smail difference of 1/2mile has a nesligible effect upon the size of the image of the fireball upon the retina, Stargered Shutters These shutters were open at zero time and closed in pairs at intervals increasing by 10 msec through 100 msec, The remainder of this series, also open at zero time, closed in pairs at 120, 250, and 1000 msec. The exact time of closing will be determined at a ‘ater date from evaluation of the high speed photogrephy sccomplished during the flesh interval. The time for the minimur following the first pulse is celeulated at 50 + 2 msec. It is of interest that 4 of 15 rabbits received burns during this period. In fact, 2 animals appear to have sustained retinal damage as early as the first 10 msee of the flash, burning duri At compsreble distances the incidence of the first pulse alone (0 to 11 oseRE <>< 0 to ) is about 25 percent for both shots, 50 msec All of the lesions from the first wave of the power pulse were mild and small, ranging from pin~point to ebout 1/3 d.d. in size. No burns were produced behind shutters open in the range between O to 60 and O to 250 msec except in one case at the latter limit where a small double burn occurred, This apparent inconsistency in the data is unexplained at the wae ue - 29 - er XW moment.