4 BULLETIN 1148, U. S. DEPARTMENT OE AGRICULTURE. 
Table 4. — Percentages of moisture regain in cotton at the different manufacturing 
Sample. 
Mexican 
Big 
Row a en. 
Boll. 
Per cent. 
Per cent. 
8.47 
8.78 
7.87 
6.92 
7.42 
7.10 
7.10 
6.84 
7.27 
6.38 
6.62 
6.62 
7.31 
7.27 
7.38 
7.48 
Tvpical 
North 
Georgia. 
From bale 
Finisher picker lap 
Lap from back of card 
Card sliver 
Finisher drawing sliver 
Fine frame roving 
Fine frame roving from creel of spinning frame . 
Yarn from spinning frame 
Per cent. 
9.20 
8.78 
8.21 
7.71 
7.61 
7.25 
7.40 
7.53 
The difference between the percentage of moisture in the bale and 
in the card sliver corresponds closely with the total percentage of 
invisible waste obtained from the pickers and cards. 
Whenever cotton in process is subjected to a given relative humidity 
and temperature for two hours or more, the cotton assumes the 
moisture regain of that relative humidity and temperature. 
The variation in moisture regain of the varieties is due to the 
different hygroscopic properties and the moisture in the bale of each 
variety. 
Therefore, the differences in the moisture content (see Table 4) 
of the finisher picker lap and the lap from the back of the card, and 
the fine frame roving and the fine frame roving from the creel of the 
spinning frame are accounted for by the fact that the relative humidity 
of the picker room averaged 70 per cent, the card room 60 per cent, 
and the spinning room 70 per cent. 
BREAKING STRENGTH OF YARNS. 
The cotton of each variety was spun into 28's, 36's, and 44's yarn 
with twists equal to 4.25, 4.50, and 4.75 times the square root of 
the number spun. The average breaking strengths are shown in 
Table 5. These averages have been corrected for slight variations 
ill the sizings of the yarn. 
Table 5. — Breaking strength in pounds per skein of 120 yards of yarn spun from the 
different varieties of cotton. 
No. of yarn. 
New T . 
9 a 
Acala. 
Lone ! Mexican 
Star. Big Boll. 
Rowden. 
Tvpical 
North 
Georgia. 
28's 
Pounds. 
69 i 4. 25 
Pounds. 
71.4 
71.2 
68.8 
Pounds, i Pounds. 
62.6 1 68.1 
62. 9 j 67. 2 
61. 3 i 66. 3 
Pounds. 
64.4 
62.9 
63. 1 
Pounds. 
57.2 
54 
44 
4.50 
4.75 
56.2 
55.9 
Average. 
70.5 
62. 3 | 67. 2 
63. 5 
56.4 
36's 
4.25 
4.50 
4. 75 
50.6 
50.4 
48.7 
45. 6 | 48. 6 
43. 7 j 46. 8 
43. 8 j 46. 4 
44.6 
44.0 
42.6 
40.5 
39.9 
39.8 
Average. | 49. 9 
44. 4 j 47. 3 j 43. 7 
40.1 
44's 
4. 25 | 38. 7 
4. 50 ! 38. 7 
4. 75 i 37. 2 
33. 7 j 36. 3 34. 
33. 9 1 33. 7 i 33. 8 
32. 8 ' 33. 3 : 33. 1 
25.2 
25.9 
25.6 
Average, j 38. 2 
33. 5 34. 4 | 33. 9 
1 
25.6 
