A "hot" engine on a B-29 is tested by means of a Geiger counter 

 operated by Colonel R. L. Snider. The B-29's, which were part of Task 

 Group 1.5, were based at Kwajalein. They were used for dropping 

 the bomb used in Test A, photography, observation, and releasing 

 special air-pressure gages. 



Plate 10 



