MANUFACTURING TESTS OF COTTON 21 
Table 11. — -Irregularity of strength of 28s two-ply yarn {single- strand test) 
Mill and kind of yarn 
Average deviation 
of strength 
F astern 
Western 
Average extreme 
variation of 
strength 
Eastern Western 
mill s 
Gray 
Bleached (single) 
Bleached (double) ' 
Mercerized 
Dyed 
MILL H 
Gray 
Bleached (single) 
Bleached (double) > 
Mercerized 
Dyed 
Per cent 
6.25 
6.01 
6.81 
7.48 
7.10 
6.25 
6.90 
6.24 
6.67 
7.18 
Per cent 
7.34 
6.14 
5.37 
7.81 
7.45 
7.34 
6.81 
8.20 
7.03 
7.01 
Per cent 
32.42 
33.50 
35.70 
39.51 
35.53 
32.42 
34.47 
33.84 
37.95 
39.21 
Per cent 
43.29 
35.68 
27.93 
39.53 
39.32 
43.29 
37.85 
41.14 
38.34 
35.38 
i Average of grades Nos. 7, 8, and 9 only. 
VARIATION OF THE SIZINGS^ 
The question has frequently arisen as to what variation in the size 
or weighings of the stock at different manufacturing processes may 
be expected. During this test w r eighings w T ere made as follows: 
Breaker picker lap, 2-yard lengths, weighings from each lap. 
Finisher picker lap, 2-yard lengths, weighings from each lap. 
Card sliver, 1-yard lengths, 24 weighings. 
Drawing sliver, 1-yard lengths, 24 weighings. 
Roving, 12-yard lengths, 24 weighings. 
Spinning, 120-yard lengths, 24 weighings. 
From these weighings the percentages of average deviation and 
extreme variation were determined. Table 12 gives the average of 
the nine grades. 
Table 12. — Percentages of average deviation and extreme variation in the sizings of 
stock at the different manufacturing processes 
Stock 
Breaker picker lap 
Finisher picker lap . . 
Card sliver 
First drawing sliver.. 
Second drawing sliver 
Slubber roving 
Intermediate roving. . 
Fine frames roving.. . 
Yarn (19.9 turns) 
Average deviation 
Eastern Western 
Per cent 
3.94 
1.28 
4.94 
2.33 
.95 
1.32 
1.37 
2.40 
1.85 
Per cent 
4.07 
1.17 
6.10 
2.10 
.95 
1.05 
1.27 
2.27 
2.13 
Average extreme 
variation 
Eastern Western 
Per cent 
12.56 
3.92 
20.88 
10.08 
5.21 
5.48 
6.16 
12.25 
9.99 
Per cent 
13.74 
3.62 
24.69 
9.62 
4.73 
5.19 
5.73 
10.30 
10.40 
3 Sizing, or size, (trade names) as used throughout this bulletin refers to the hank or the number of the 
yarn. 
