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INSTRUMENTS— THE PROOF OF THE OPERA- 

 TION. UPPER. Technicians prepare panels of fab- 

 rics for exposure to the effects of the atomic 

 bombs. LEFT. Rear Admiral W. S. Parsons, Deputy 

 Task Force Commander for Technical Direction. 

 He was responsible for all principal technical ac- 

 tivities involving bomb detonation and determina- 

 tion of all scientific and technical results. 



OPPOSITE, ABOVE. Experts examine pyramidal 

 orientometers on a target ship. These devices in- 

 dicate the direction from which the heat and ra- 

 diation from the atomic bomb came, in terms of 

 burns produced when radiation passes through the 

 tiny holes shown and strikes the base of the instru- 

 ment. BELOW. Dr. C. W. Lampson of Princeton 

 University and Captain A. E. Uehlinger, USN, 

 insoect an aluminum foil gage. 



