29 



447 



Diaphragm - 



■ — Point Spots 



Initiation Bending Wove 



of Mot on Reccnes Center 



- C a tf 'fat ,on 

 Closed Up 



Figure 22a - High-Speed Streak Photograph 



Oiaphro gni 



Third 

 Pulse 



Figure 22b - Low-Speed Streak Photograph 



Covitotion 



Closed Up- 



I mil hsecond 



D'aphrogm 



-Center ^— Point Spots 

 Spot 



Bending Wove Traveling In 



-Bulging Due to Pressure m 

 Woter OS Covitation Closes 



Figure 22c - Medium-Speed Streak Photograph 



More than three spots were painted on the diaphragm to show more clearly 

 the transit of the bending wave. 



Figure 22 - Typical Streak Photographs of Motion of Diaphragms 



