APR. 

 



MAY 

 1 



JUNE 



2 



JULY 



3 



AUG. 

 4 



SEPT. OCT. NOV. 



5 6 7 

 MONTHS 



DEC. 

 8 



JAN. 

 9 



FEB. 

 10 



MAR. 

 11 



APR 

 12 



-e- 



LEGEND 

 ■ MONTH TEST PANELS 

 -MONTH TEST PANELS 

 -MONTH TEST PANELS 



FIGURE 7. TOTAL WET WEIGHT (IN AIR) OF FOULING 





4U 



35 



1 1 1 1 





30 





(C 



?5 





v. 













N 















?() 





1- 







T 







O 







LLl 



5 



15 







10 





APR. MAY JUNE JULY AUG. SEPT. OCT. NOV. DEC. JAN. FEB. MAR. APR. 



1 2 3 4 5 6 7 8 9 10 11 12 



MONTHS 



LEGEND 

 (1) . CUMULATIVE FOULING AS OBTAINED BY INCREASING 



TEST PANEL EXPOSURE (SETTING AND GROWTH) 

 (2 ) O CUMULATIVE FOULING, MONTHLY TEST PANELS 



(SETTING) 

 (3) O DIFFERENCE BETWEEN 1 AND 2 (GROWTH) 



FIGURE 8. ACCUMULATED WET WEIGHT (IN AIR) OF FOULING 



