-I 1 — I — i—r- 



_i I 1 I I i_i_L 



D, mm 



0.5S 

 0.21 

 O.IS 



O Q tamped 



Figure 12. Observed (j)^, as a function of a/D and r (or D) . 



The dashline is the composite curve from Figure 2, 



41 



