54 31 



54 32 



Page Figure 



53 2 9 Plots of frequency vs. depth for 



pneumatic sound source 

 53 30 Typical waveform produced by 1. 3- inch 



pneumatic sphere 

 Close-up view of surgical rubber tube 



after rupture 

 Close-up view of rubber sphere after 

 rupture 



56 33 Photographs of bubble development from 

 2- inch sphere 



57 34 Photographs of bubble development from 

 2- inch sphere 



59 35 Original model of acoustic bomb 



59 36 Acoustic bomb with Mark 15 Mod 



pressure mechanism 

 61 37 The "Wolf Whistle" 



