MANUFACTURING TESTS OF COTTON 
13 
The single-bleached western yarns were approximately 10 per cent 
weaker than the gray, whereas the double-bleached yarns were 22 per 
cent weaker than the gray. The double-bleached yarns were 13 per 
cent weaker than the single-bleached. The dyed blue western yarns 
were 5 per cent weaker than the gray. These percentages are based 
on the averages of grades 1 to 9 (fig. 6). 
STRENGTH 
IN POUNDS 
SKEIN TEST 
100 
90 
60 
70 
60 
6 5 4 
GRADE NUMBERS 
Fig. 6.— Skein strength of 22s gray and treated yarns spun from western cotton. (21.1 turns per 
inch in yarn.) The gray yarn is stronger than the treated yarn. The decrease in strength of 
grade 3 is probably due to the influence of weather or cultural conditions upon the strength and 
character ot the cotton. The extent to which double bleaching has decreased the strength of the 
yarn from that of the single bleach is shown 
A comparison of the results in Figures 5 and 6 and of the two 
preceding paragraphs shows that the eastern and western cottons 
were similarly affected when bleached and dyed by the same method. 
22s WARP YARN (SINGLE STRAND) 
The single-strand method is advocated by some manufacturers in 
preference to the skein method on the supposition that it gives a truer 
index of the quality of the yarn. Correction has been made for differ- 
ences in the size of the yarn by multiplying the average machine 
break of the single strand by the average size found in the skein break 
of the corresponding yarn and dividing this result by 22. Figures 7 
and 8 show graphically the results of the single-strand tests. 
