j = ie “7 “ : ee — icc | me ie 
bas Bel eel Waar Pad are) Sel to (ea chaste. sf taste Pore bees or pee es Bre ET 
Figure 66. Spall crater in specimen of Barre granite made with a single shot of 
cumulation jet under water. 
: return flow 
inlet flow 
core barrel 
liquid 
spring 
General Dynamics Underwater Vibrator 
1FO-1AP05369. Vibratory force is 
11,000 Ib at 60 Hz. This is a modified 
commercial device and is protected by 
patents and patents pending. 
Figure 67. Proposed high-power hydraulic oscillator for driving indentor in 
seafloor rock drilling and disintegration. (After drawing by 
General Dynamics, Rochester, New York.) 
89 
