FISH-NET PRESERVATIVES. 



S9 



TESTS WITH COTTON LINES. 



MATERIALS TESTED. 



The preservatives and preservative methods tested for cotton lines 

 were the Dutch method, L; copper paints, Nos. 1 and 2, Q and R; 

 petroleum product No. 2, designated X; copper oleate in gasoline, 

 AA; copper oleate followed by coal tar diluted with benzol, Y; and 

 copper oleate mixed with coal tar and the whole diluted with benzol, 

 Z. The shrinkage and increase in weight caused hj the preservatives 

 were noted; the data for these factors will be considered later. 



TENSILE STRENGTH. 



The tensile strength of the lines exposed at Put in Bay are given in 

 Table 17 and are shown graphically in Figure 25. 



2 3 4 



NUMBER OF MONTHS EXPOSED 



Fig. 25.— Tensile strength of cotton lines exposed in fresh water at Put in Bay, Ohio. 

 Table 17. — Tensile strength of cotton lines exposed in fresh xcater at Put in Bay, Ohio. 



Symbol and treatment. 



Unex- 

 posed. 



Number of months exposed. 



Tensile strength in pounds. 



A — While line, untreated control 



L — Dutch method 



Q— Copper paint N o. 1 



R — Copper pain tNo.2 



X — Petroleum product No. 2 



Y — Copper oleate 15 per cent, benzol 35 per cent, coal tar 



50 per cent 



Z — Copper oleate followed by coal tar 



AA — Copper oleate 15 per cent in gasoline 



139.3 

 38.6 

 41.5 

 42.7 

 32.9 



35.0 

 36.0 

 38. 



(") 



33.0 

 42.7 

 49.7 

 (») 



48.4 

 45.6 



I Average of 60 breaks; every other figure in this table is the average of 15 breaks. 

 > Line was disintegrated and gone. 



