CONDENSATION CLOUD, TEST BAKER. Wheth- 

 er man can ever produce rain is questionable; but 

 that he can produce a larae region of fog is proved 

 by this photograph. Dwarrinq the ships silhouetted 

 against it, the roughly spherical region contains 

 over one cubic mile of fog. On a gigantic scale 



this cloud is reminiscent of tiny clouds produced 

 nearly 50 years ago by the English scientist C. T. 

 R. Wilson, who was experimenting to find the 

 causes of fog and rain. His studies of expansion, 

 cooling, supersaturation of air, made using expan- 

 dible chambers of metal and glass, won him renown. 



