FISH-NET PRESERVATIVES. 



23 



Results of Jlexihility tests. — The samples included in the Beaufort 

 series were all tested for flexibility (1) immediately after treatment, 

 and (2) after each month of exposure in the water. In Table 8 and 

 in Figure 11 the results of these tests are given; in Figure 12 the same 

 results are shown by grouj^s of preservatives that had a similar effect 

 on flexibilitv. 



60 



50 



40 



o 30 



r 20 



2 3 4 



NUMBER 0FM0NTH5 EXPOSED 



Fig. 12.— FlexibDity of cotton lines exposed in sea water at Beaufort, N. C, grouped. 

 Table 8. — Flexibility of lines exposed to ocean water at Beaufort, N. C. 



Symbol and treatment. 



Unex- 

 posed. 



Number of months exposed. 



Number of oscillations. 



A — A\Tiite line, untreated control 



F — Coal tar o() per cent, benzol 50 per cent 



G — Pine tar 50 percent, benzol 50 per cent 



H— Pine tar 25 per cent, coal tar 25 per cent, benzol 50 per 



cent 



I — Quercitron and potassium bichromate 



J — Petroleum product No. 1 



L — Dutch method 



M — Copper oleale 7i per cent in gasolhie 



N — Copper oleate 12J per cent in gasoline, 5 per cent oU, 



1-10(X) crcsol 



O — Copper oleate 12J p^t cent in gasoline 



P — Copper oleate 12i per cent in gasohne, 2 per cent oil 



Q — Copper paint No. 1 



R — Copper paint No. 2 



S — GUsonite 



X — Petroleum product No. 1 



8 



(») 



(') 



40.5 

 49.7 



65.4 



57.3 



64.4 



34.6 



34.6 



(») 



(?) 



> Every figure in this table is the average of 100 tests. 

 ' Sample was disintegrated and gone. 



The most flexible lines after treatment are those treated with 

 copper oleate, M, N, O, and P, which make around 60 oscillations; 

 those treated by the tanning methods — that is, quercitron and potas- 

 sium bichromate, I, and the Dutch method, L — are next in flexi- 



