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Figure 1 - 



(a) The diaphragm receives an initial impulsive velocity v, 

 denoted by vertical arrows, 



(B) The material has a radial velocity distribution, 

 denoted by horizontal arrows, and is restrained from 

 moving at the periphery. 



(C) The bending wave, shown by the sharp corners in the 

 profile has progressed inward froia the edge, 



(D) As the diaphragm deforms further, the central region 

 remains flat and moves with its initial velocity v. 

 The bending wave is traveling into the central region 

 and progressively deforming it, 



(E) As the bending wave nears the center it speeds up 

 slightly, 



(F) The speeding up of the bending wave results in rounding 

 off the apex of the conically deformed diaphragm. 



