INTRODUCTION The a: was detonated on Eninmen Island of Te a eee lap wr Sd roel er ee car EE REEMee gd Be en ne 7 oem was gestnedby the UCRL at Livermore to used in the previously tested devices. At the time of firing the atmospheric conditions with respect to fall-out and sampling criteria were satisfectory, 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 ebout 4 A.M. until about ten minutes before shot time. At shot time the transmission from Fmninman 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, end the ecrly "hot spot" photography also failed even though the instru- mentation operated properly. by other meens However, enough data were obtained (Radiochemistry, progress of reaction studies, threshold detectors, shock arrival times) to obtein a fair picture cf what went on. the times of arrival «nd overrressures on Airukiraru, s.ruxtiji and Eniirixku indicate a to al energy release of sore aa yt 5 a4 = DELETED ceneofooe LANL, J-Diy. a 77 £0