458 



uo 



5.0 



4.0 



3.0 



2.0 



I .0 



12 16 20 24 



d(, , Charge Dislonce in inches 



28 



32 



Figure 35 - Final Central Deflection Zr^ As Measured 



r 



from the Diaphragm Profiles 



The crosses denote estimated central deflection of the ruptured diaphragms. The curve through 

 the unruptured diaphragms agrees well with that of Figure 3A- 



It may be noted from Figure 22b that the 60-cycle vibrations of the 

 bottom plate of the boat are again excited by the second blow, and again by 

 the third blow. This can be verified by an inspection of the streak photo- 

 graph. The time Interval between the second and the third blows has been 

 measured and found to be about 58 milliseconds, which is shorter than the 

 interval between the first and the second blows. This probably results from 

 the shortened period of oscillation of the gas globe as it loses some of its 

 energy in the successive pressure waves emitted during its compression phases. 



Diaphro gm 



Third 

 Pulse 



Figure 22b - Low-Speed Streak Photograph 



