@ monkeys exposed to the flash of this shot. stations. Calculated Leaions resulted st all caloric yields at the exposure sites ranged from inversely corresponmiing to distances of 2,7 to 8.1 statue miles, Bo Re 3t 8 Blink reflex exposuves produced chorioretinal damage in 2] of 38 rabbits and 6 of 8 monkeys. Fwaluation of blink reflex time (in this case, the time ani duration of eye exposure) awal‘.s appraisal of the high speed photography of the animal eyes during the explosion. Laboratory stuiies using increasingly powerful photoflash bulbs f reveals a relatively constant blink reflex time of approximately 320 ms for rabtits ani monkeys and about 160 as for man. Using similar blink reflex times and recognising the twofoli greater relative opening of the rabbit pupil, earlier investigations estimated that the rabbit ia susceptible to retinal burns at distances about 25 percent greater than those equally harmful to man, Py analogy therefore, the pro- duction of burns at 8,1 statue miles extrapolates to 6.5 miles for man. — As eviiencel by the data it was noted that emaller (and apparently less severe) lesiona were encountered at increasing distances fros the fireball, Detaiis of burn pathology must avait laboratory study which Gannot be accomplished at the Pacific Proving Grounds. It is of interest to observe that retinal heworrhaging in this exposure series was associate! with what appears to be lesions of intermediate severity. This is in contrast to the findings of previous investigators who noted hemorrhaging in connection with the most severe burns. It may be that et4itional information on the incidence of this reaction and/or other cOPY BEST AV AILABLE = COPIED DOF SAIYA RS /S Ge