50 



U. S. BUEEAU OF FISHERIES. 



ment, revealed, by difference, any change in lengths of the lines. 

 Table 23 exliibits the results so obtained, wliich are also shown 

 graphically in Figure 32. 



LENGTH OFLINEBEFORf: 

 TREATMENT 100 



IJKLMNOPQRSXYZ 



Fig. 32.— Shrinkage of cottou lines caused by one application of the various preservatives. 



Tablk 23. — Shrinkage of cotton lines caused by a single application of each of the various 



preservatives. 



Symbol and treatment. 



Per cent shrinkage. 



Wash- 

 ington. 



Key 

 West. 



Beau- 

 fort. 



Woods 

 Hole. 



Putin 

 Bay. 



Aver- 

 age. 



B — Copper oleate 7 per cent 



C — Copper oleate 7 per cent; 5 per cent oil, 1-1000 cresol. 



D — Copper oleate 1 1 per cent 



E — Copper oleate 11 per cent, 2 per cent oil 



F — Coal tar 50 per cent , benzol 50 per cent 



Q — Fine tar 50 per cent, benzol 50 per cent 



H — Coal tar and pine tar each 25 per cent, benzol 50 per 



cent 



I — Quercitron and potassium bichromate 



J — Petroleum product No. 1 



K — Proprietary waterproofing material 



L — Dutch method 



M — Copper oleate 7^ per cent 



N — Copper oleate 12| per cent, 5 per cent oil, 1-1000 



cresol 



O — Copper oleate 12^ per cent 



P — Copper oleate 12| per cent, 5 per cent oil 



Q — Copper paint No. 1 



R— Copper paint No. 2 



S— Gilsonite 



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 



1.4 



.S 

 2.1 

 1.9 



1.4 

 2.4 

 2.0 

 2.1 

 2.4 



1.4 

 1.4 

 2.1 

 1.9 

 1.4 

 .9 



2.2 

 5.2 

 2.6 

 2.1 

 2.4 



2.9 

 2.9 



2.4 

 3.5 

 2.4 



3.2 

 .1 



.4 

 1.1 

 1.1 

 2.5 



.3 

 2.7 

 1.1 



1.0 

 1.0 

 1.7 

 1.3 

 2.1 

 1.9 



2.0 

 3.7 

 2.5 

 2.1 

 3.0 

 .1 



.4 

 1.1 



.7 

 1.2 



.4 

 2.7 

 1.0 



.4 

 .4 

 .0 



