Vogel and Patterson 



different bodies in water and also in water with 200 and 1000 parts per million of 

 Polyox 301 additive. Most of the bodies were cones or spheres. The drag of the 

 bodies was obtained through the photographic measurement of their terminal 

 velocities using a darkened room and a strobe light for illumination. Separate 

 photographs of the boundary layer separation and wake shape were obtained in a 

 similar series of drop tests in which particles of potassium permanganate were 

 attached to the aft end of each body. Figure 1 is a photograph of the wake flow 

 behind a 2-inch sphere in plain water and in 200 and 1000 ppm Polyox solutions. 

 Note that the point of boundary layer separation has been shifted rearward. Figure 

 is a typical photograph of the multiple images of a falling cone produced by the 

 strobe-light technique. 



^ 



i 



4 



ppm 



200 ppin 



Figure 1 



1,000 ppm 



998 



