,fiiii*>rf'1i^ mtfft^^ 





UPPER. Insidious almost be- 

 yond belief, the great mush- 

 room cloud conjured in Test A 

 harbored radioactive fission 

 products equivalent to hun- 

 dreds of tons of radium. 

 Manned planes v/ere kept 

 miles away, but drone planes 

 v/ere guided directly through 

 the cloud, sampling its content 

 v^ith the aid of filters mounted 

 in boxes attached to the under- 

 sides of the planes' wings. Re- 

 moving the filters was done 

 with great care. LOWER. A 

 radioactivity check is made on 

 a goat exposed to the Test A 

 explosion. 



Plate 24 



