• -f 





FitOw M 



^ ^ ii 



i « 





1 -I .1 ^■"' • 



^ fc -'^ r. -; . - ^ ^ 



1-" 

 1 





^^^^ 



' .'.. ^-. ': ■ 



/ 



-1 •■ % 



Figure 5 - Typical Bubble Patterns Behind a Two-Inch Plate 

 (Preestream Velocity Is l6 fps) 



33 



