474 



70 



60 



£ 50 



I 40 



t 



Q 

 O 

 E 30 



20 



lO 



Theoretic*! period ot I oscillation for \oz TNT. 

 omitting effects of bottom and free surface 



2 oscilUtion 



{ 2 3 



DISTANCE OF THE CHARGE FROM THE BOTTOM -Feet 



Fiq.7 OBSERVED PERIODS OF THE \ AND 2 OSCILLATIONS OF THE 

 BUBBLE PRODUCED BV FIRING lor CHARGES OF PAG. AT 

 VARIOUS DISTANCES FROM THE BOTTOM 



