Of +? pee a: NIRODUCTION TT se Erde oy me was designed by the UCRL at Livermore to - we een teen = than that used in the previously tested devices. to fall-out and sampling criteria were satisfactory, but heavy showers in the area caused serious difficulties from the point of view of test instrumentation. Records show that the light trans- mission conditions were such as to automatically prevent firing of the shot from about 4 A.M. until about ten minutes before shot tine. At shot time the transmission from Eninman to Enyu was sufficient to allow firing, but scattering of the Light by fog or rain was such as to prevent proper photography. Thus no photo- graphs of the fireball were obtained from any station, and the early “hot spot" photography also failed even though the instrumentation operated properly. However, enough data were obtained by other meens (Radiochemistry, progress of reaction studies, threshold detectors, shock arrival times) to obtain a fair picture cf what went on. The times of arrival and overrressures on Airukiraru, es . .. —— mT tae As *.Tuxtiji and Eniirixim indicate a total energy release of sone -% we me nett PG “DELETED Awe -_ £0 - mee At the time of firing the atmospheric conditions with respect sow . a ee 1 ern amene ae ERS rheEEEshot was detonated on Eninman Island of