PRESEEVATlOlSr OF FISH NETS 



431 



TESTS WITH LINEN LINES 



A set of linen lines treated with the rarious preservatives was also 

 exposed at Fairport, Iowa. The action of the water was so severe 

 at this point, however, that none of the samples lasted until the end 

 of the first month, so that no measurements could be made of the 

 factors under consideration. 





PC 



12 3 4 



NUMBER OF MONTHS EXPOSED 



Fig. 15.— Flexibility of hemp lines exposed at Fairport, Iowa 



SUMMARY OF RESULTS AT FAIRPORT 



1. At Fairport coal tar was the best preservative of the tensile 

 strength of cotton, sample lines so treated lasting four months. 



2. The copper oleates and the copper oleate-coal tar mixture pre- 

 served cotton lines for two months. 



3. All sample lines except those mentioned above were entirely 

 rotten in one month. 



