12 



1.6 





















n r. 

























1.2 



1.0 

 o 







/ 



< 



















/ 



\ 

 Theoretical Curve 



oElectrolytic Tonk Values 











^ 





















0.6 



/ 





















0.4 

 0.2 



/ 





















. 





















0.1 



0:2 



0.3 



0.4 



0.5 



0.6 



0.7 



0.8 



0.9 



1.0 



Figure 6 - Velocity Distribution About a Sphere 



where (-^ | is the potential gradient in the tank without the model. 

 \^^ Jo 

 The pressure coefficient at each point is found by the equation 





[18] 



In the following examples, the experimental techniques used vary slightly for the dif- 

 ferent bodies as improvements were made in the apparatus, instrumentation, and methods 

 of analysis. 



SPHERE 



The first body of revolution investigated in the TMB electrolytic tank was a sphere. 

 The model was a quartet section of a wax sphere 2.5 in. in radius; it was mounted on a poly- 

 styrene plate which was aligned along one of the longitudinal walls of the tank. This body 

 was studied before the introduction of the fine wire on the section above the water surface or 

 the installation of the micrometer screws for the x and y motions; 60-cycle alternating current 

 was used without a tuned circuit across the null instrument. Under these conditions, the 



