Taylor and Wells. — Preservation of Nets and Lines. 



63 



Table V. — Wearing tests on No. 24 cotton lines exposed at 

 Beaufort, N. C. 



Sym- 

 bol 



A 

 F 

 G 

 H 



I 

 J 



L 



M 



N 



S 

 X 



Treatment 



White line, untreated. . . 



Coal tar 



Pine tar 



Pine tar and coal tar 



equal parts 



Bull's method 



Petroleum Product, 



No. 1 . . 



Dutch method 



Copper oleate, 8 mg. 



copper per yd. of line . 

 Copper oleate, 12 mg. 



copper per yd. of line; 



oil 5%; cresol 1-1,000. 

 Copper oleate, 18 mg. 



per yd. of line 



Copper oleate, 18 mg. 



per yd. of line; 2% 



oil 



Copper paint I plus 



50% creosote oil; 60 



mg. copper per yd. 



' length 



Copper paint II, 270 



mg. copper per yd. 



length 



Gilsonite 



Petroleum Product, 



No. 2 



Niunber of strokes against itself necessary 

 to wear out samples 



Not 

 ex- 

 posed 



264.7 

 189.4 

 159.7 



168.5 

 50.9 



281.3 

 46.6 



118.4 



127.5 

 191.1 



141.7 

 23.0 



89.0 

 280.0 



132.0 



Exposed, months 



56.8 

 172.4 

 141.4 



171.6 

 45.1 



124.2 

 84.6 



167.4 



157.3 

 191.9 



228.8 

 57.4 



30.8 

 207.4 



31.8 



X 



95.4 

 97.8 



107.2 



X 

 X 



79.4 

 141.2 



117.0 

 143.6 



157.4 

 43.6 



17.0 

 24.4 



X 



103.9 

 75.1 



92.6 



X 

 X 



91.0 

 129.2 



150.9 

 123.3 



182.4 



58.7 

 17.9 



X 



X 



34.4 

 57.4 



43.6 



X 



88.4 

 12.8 



79.4 

 40.4 



122.0 



56.7 

 12.5 



X 



X 



14.9 



X 



9.8 



X 

 X 



1.3 

 8.1 



42.8 

 48.1 



13.0 



34.2 

 14.0 



X 



X Indicates that samples were disintegrated and gone. 



DISCUSSION OF EXPERIMENTS ON WEARING QUALITY. 



There is seen to be a wide variation in wearing quality. This 

 quality of lines is influenced by the hardness or stiffness of the 

 preservative. When it is dried out and wiry, the line wears out 

 more rapidly than when it is soft and pliable. In the case of 

 lines that have been exposed in the sea, there is an unavoidable 

 deposit of sediment, sand, etc., among the fibers that probably 

 increases abrasion in the test. Although the samples were 

 washed before being tested, probably some of this sediment still 

 remained. A sticky or adhesive preservative pulls out the fibers 



