2. Or 



1.0 



0.8 

 0.6 



0.4 



0.2 



.S 





•••• 







Figure D-1, Semilogarithmic plot of f versus I, where I = 3d/g 



(see Fig. 5), An approximation of the plotted values is 

 f = 2,8 (1-d/g) with a correlation coefficient of -0.94. 



91 



