nSH-NET PEESEB.VATIVES. 



41 



Tlie most flexible of all the linos exposed are those treated with 

 copper oleate, AA; then comes untreated line, A, and that treated 

 by the Dutch method, L. Considered together the lines treated 

 with copper oleate and tar combinations, Y and Z, and copper paints, 

 Q and R, are very stiff, though the stiffest is copper paint No. 2, R, 

 and the most flexible is the combination, Z, which is copper oleate 

 followed by tar, \vitli copper paint No. 1, Q, and the mixed copper 

 oleate and tar, Z, an intermediate. The petroleum residue, X, also 

 markedly stiffens the lines. 



80 



70 



60 



o 40 



t 30 



20 



12 3 4 



NUMBER 0FM0NTH5 EXPOSED 



Fig. 26.— Flexibility of cotton lines exposed in fresh water at Put in Baj-, Ohio. 



The tendency toward increasing flexibility of all the lines is an 

 indication of general deterioration ; as they lose in strength and general 

 quality they become more and more flexible. 



WEARING QUALITY. 



The results of the tests of wearing quality of the lines in the Put in 

 Bay series are given in Table 19 and are shown graphically in 

 Figure 27. 



