22 



LC 







X 





/'••■ 











/ 



"\\ 



/ 



, 0.4 



/ 0.6 



/ / p 8 











a' 



°-"^ N 



//^ 



// 1.0 











(r 



^ — ^ 



^ 



/ //2.0 















V 1 



1 







^^^ 









mri-^ 



? 



"» 







-/ 

















^^>^ 



yd 















// 

















"/ 















Figure 13 - Pressure Field in a Meridian Plane About a Sphere 



(Solid lines are theoretical curves.) 



The pressure field obtained in a meridian plane about the sphere is shown in Figure 

 13; the solid curves show the corresponding theoretical values. The scatter of the points 

 from the theoretical curves is equivalent to an error of about 1 percent in determining the ve- 

 locity. As the potential gradient can usually be obtained within 1 part in 500, the rest of the 

 error is in the free-stream value or in setting the probe. 



PERSONNEL 



The electrolytic tank project was initiated by P. Eisenberg who prepared the prelim- 

 inary design. The development of the tank, its equipment, and the experimental procedures 

 were carried out by A. Borden with the assistance of W.E. Ball, Jr., and G.L. Shelton, Jr. 

 The report was checked by P. Granville. 



