/Oi 



NHTURHL BRIDGES 



PRRTICLE SIZE DISTRIBUTION 

 niLLIHETERS 



DO 3.50 3.00 

 1 1 



2.50 2.C 



1 



1.50 



1 





D .90 .80 .TO .60 .5 



1 1 1 



.10 . 



I I 



i5 .30 .2 



I 



5 .20 



I 



.15 



. 1 



.10 .0^ 



1 1 



.09 .07 .06 

 1 1 













































































































































































































































































































































































- 



2.00 



50 -1 



00 -c 



.50 -C 



.00 *( 



.50 *] 





50 



.00 



.50 *3.00 «3.50 ~1 



.oc 



VERY C0FR5E 5FM3 



IOJTUDRTH SCR£ 



E- 15 



