Water 



< 



Line of 



Observation 



Sun Gun Mounted 

 obove Water Level 



• Water Level 



(a) 



Side Wall Painted Black for 

 Contrast with the Rows of Bubbles 



Plane in which Bubbles Appear 



Closed Jet Test Section 



Water 



• Water Level 



< 



Line of 



Observation 



ne in which Bubbles Appear 



Figure 11 - View Parallel to Stream Velocity (Looking Upstream) of One 

 Lighting Scheme (a) and an Improved Setup (b) 



39 



