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INDUSTRIOUS INFERNO. As the mushroom cloud 

 climbs higher into the sky, a second smaller mush- 

 room top appears high on the "stem." The stem 

 itself is composed of a mixture of ascending vapor, 

 steam, spray, smoke, and radioactive fission prod- 

 ucts. In the vicinity of the stem there is a power- 

 ful updraft which sucks inwards and upwards the 

 soot and smoke spouting from the target ships, 

 and spews forth its insidious content into higher 

 altitudes. When this photograph was taken the 

 cloud had risen to about 12,000 feet. 



