42 U. S. BUREAU OF FISHERIES. 



Table 19. — Wearing quality of lines exposed in fresh ivater at Put in Bay, Ohio. 



Symbol and treatment. 



Unex- 

 posed. 



Number of months exposed. 



Number of strokes. 



A — White line, untreated control 



L — Dutch method 



Q — Copper paint No. 1 



R — Copper paint No. 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 



35.5 

 31.5 

 15.3 



(2) 



92.0 

 111.5 



1 Average of 100 tests; every other figure in this table is the average of 50 tests. 



2 Line was disintegrated and gone. 



340 



320 



300 



280 



260 



240 



220 



200 



180 



160 

 u 



SI40 



)- 

 >o 

 -120 



e£. 



filOO 



s 



^80 

 60 

 40 

 20 





2 3 4 



NUMBER OF MONTHS EXPOSED 



Fig. 27.— Wearing quality of cotton linos exposed in fresh water at Put in Bay, Ohio. 



The leaders in this test are by long odds the lines preserved with 

 the copper oleate and tar combinations which, even after three 

 months' exposure, are still more resistant to wear than any of the 

 others even before exposure, with the single exception of unexposed 

 white line. This result agrees with the result at Woods Hole, where 



