Bubble lines from straight wire 

 positioned behind plane of 

 streaklines. A seporote pulsed 

 power source is used. 



straight Wire 



Kinked Wire 



Streaklines from kinked wire energized with 

 >■ d_c- power source. These lines ore referred 

 to in later discussion as horizontal lines. 



Figure 3a 



Bubble Pattern for Longitudinal and Transverse Velocity 

 Field 



30 



