379 



rise due to gravity; in certain cases, they may actually produce a downward 

 motion of the globe. 



The results found by acceptance of the assumptions given and by use 

 of the approximations are summarized in a series of formulas and curves. Many 

 of the results are stated in terms of the radius iZg of the globe at maximum 

 expansion. For tetryl or TNT, this Is estimated from observation as 



Ro = 4.1 



W'\3 



(f) 



[18] 



where R2 is in feet, 



W is the charge weight in pounds, and 



p^ is the total pressure, including atmospheric, expressed in 

 atmospheres. 



Figure U presents this information graphically. 



Chorge Weight W in pounds 



Figure U - Maximum Radius R^ on First Expansion of the Gas Globe 

 Produced by a Charge of W Pounds of Tetryl or TNT 



The center of the globe is d feet below the surface of the sea; lines are drawn for 

 several values of d; see Equation [18] at top of page. 



Vertical migration due to gravity alone is a special case treated 

 first by the approximate method. By neglecting the action of the gas in the 

 globe, it becomes possible to express the solution in dlmensionless terms, 

 and this Is done for four depths In Figure 5 on page 13, and In Table 1 on 

 page 13. The minimum depth below the surface at which recompression will 



