622 



PIPPARD AND CHITTY ON EXPERIMENTS ON THE 



were unimportant. There were, however, differences between the corre- 

 sponding tests on the steel drum which indicated that the time factor was 

 of some importance. 



Fig. 7. 



RAM DISPLACEMENT INCHES 



Load-Displacement CnBVB foe 



Static Test on Unstiffened 



Steel Drum. 



Fig. 8. 



CoNTOUKS Resulting fbom Static and 

 Dynamic Twists on Unstiffened 

 Steel Drum. 



Fig. JO. 



Fig. 9. 



ram displacement ; inches 

 Load-Displacement Curve 

 FOB Static Test on Copper 

 Drum. 



CoNTOiTRS Resulting from Static and 

 Dynamic Tests oh Copper Drum. 



