

Fig. 5. Fiberglass cylinder with manometer needle attached prior to testing in pressure tank. 



Fig. 6. Aluminum sphere of 0.09^ inch wall 

 thickness and 3-0 inch diameter 

 crushed at 5,300 psig (deformation 

 began at ^,900 psig). 



Fig. 7- Fiberglass cylinder crushed at 10,200 psig. 



171 



