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PROGRESS OF THE SHOCK WAVE. In this re- 

 markable photograph the Test Able explosion is 

 shown in another early stage of development. Lo- 

 cation of the shock wave is indicated by the flat 

 white ring expanding across the lagoon's surface 

 from the center of the explosion and its enveloping 



condensation cloud. This view also gives a good 

 impression of the general relation of the bomb 

 test site to the Bikini Atoll, seen here as a sprawl- 

 ing elliptical chain of islands linked each to each 

 by shallowly submerged reefs. The large island in 

 the foreground is Enyu. 



