391 



Charge Weight W in pounds 



Figure 4 - 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 Eqxiation [18]. 



giving the equivalent depth d In feet below the surface of the sea, so that 

 p^ = 1 + d/35. 



With this value of R2 s"'^ with M, N^, Ny, N ^ now expressed In terms 

 of feet, Equations [15] and [17] become 



F = 



"■' (F 



f^. 



0.009 



[19] 



4000 fi2 



B,.0.H2[, + 0.94«@*]«,!!^|-3.75[l-0.,4M(i)V,©*[201 



or. If the small term In M Is dropped, approximately. 



yy i I yy \ 



B^ = 0.142 c;, -^ - 3.75 AT^ — 



P 3 ''Fi' 



Pa 



[21] 



with similar equations in Y and Z. 



The accuracy of these approximate formulas is hard to estimate. 

 Serious doubts arise as to their validity when the center of the gas globe 

 comes closer to any bounding surface than ZR^ or twice its maximum radius. 

 No correction has been made for the change In hydrostatic pressure as the 



