729 



The expression (6) for the first period of the globe is invalid when th« distance of the 

 center of the globe from a bounding surface is less than 1.2 L . Nevertheless, in the 

 absence of any other information the value of the first period for Z " 1.2 i_i will be used 

 heuristically for Z^ $ 1.2 Lx . On this basis T* and T* have been computed for 

 various charge weights of TOT over a range of depths; these values are given in Table 3. 

 The function S_' r-\ /i , , t ) can be readily obtained from the master function 



*■£< 



&-• { h- I , i ); its characteristic properties for different values of yt' are 

 represented for / = 0.1 and 1.1 on the various graphs, viz., 2, 3, ^. 



One additional quantity is req^^i^ed for the determination of the pressure 

 p, ( A'» Z.', t ), namely, the average voluae cf the gas globe. Thus the time average of 

 the volume for the first period is given by 



where Q.( t ) is the Instantaneous radius of the bubble at the time L . The diaensionlese 

 quantity ^ / l_j has been calculated 3) for a globe situated in an infinite liquid with no 

 free surface at a distance of 1.2 L from a rigid wall. Uelng these values we find the 

 average of \0. ( t )\ ^ over the first period to be 0.4819. Thus we obtain 



If the explosive is on the bottom, its gas globe is about half of an oblate spheroid. 



23 



