Table 1. Symbols used to denote combinations of 



D and N. The third independent variable, 

 T, is not denoted. 



N, 



D = 0.55 mm 



D " 0.18 mm 



D - 0.21 mm 



identification 



o/d symbol 



yo 



symbol 



(Vq symbol 



20 





508 



¥ 





25 





636 



► 



545 •- 



26 



216 









30 



250 O 



763 



< 



653 il 



33 



275 Q 









40 



333 O 



1017 



T 



872 f 



50 



416 



1271 



> 





52 



433 









60 



500 O 



1525 



-4 



1307 -• 



80 



666 O 







1743 1» 



100 



832 O 



2542 



▲ 





compressed 

 surface 



500 D B 









expts. 37-47 



various <> 









34 



