﻿BULLETIN 1U*, V. S. DEPARTMENT OT AGRICULTURE. 



Tahi.e •!.- /'( m uiiiij, ■.■>• q/" moisture regain in cotton at the different manufacturing 



processes. 



Sample. 



Acala. 



I. one 



Mexican 



Star. a 



Pi r ci "'. /Vr cent. 



From bale ; 7. 7* 



Finisher picker lap 7. .V2 



Lap from back of card 7. 01 



Card sliver 6.74 



Finisher drawing sliver 6. 66 



Fine frame roving i 6. 96 



Fine frame roving from creel of spinning frame ! 7. 17 



Yarn from spinning frame 7. 84 



7. si 

 7. 64 

 7.36 

 6.'*) 

 7.12 

 6. 97 

 7.25 

 7.64 



1'ircrnf. 

 S.47 

 7.87 

 7. 12 

 7.10 

 7.27 

 6. 62 

 7.31 

 7. 38 





- 





Tvpical 



Rowdcn. 



North 





Georgia. 



l'ir mil 



Per cent. 



8.78 



9.20 



6. 92 



8.78 



7. 10 



S.21 



6.84 



7.71 



6.38 



7.61 



6. 62 



7.25 



7.27 



7.40 



7. 18 



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 iinisher 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 

 in the sizings of the yarn. 



Table 5. — Breaking strength in pounds per skein of liO yards of yarn spun from the 



different varieties of cotton. 



No. of yarn. 



New i T . . 

 Draper ' ™t 

 Stand- m , l ' t r 1 



ard. P lier - 



Acala. 



Lone 

 Star. 



Mexican 

 Big Boll. 



Rowden. 



Typical 



North 



Georgia. 



28's 



Pounds. 

 69 



54 



44 



1. 25 

 4.50 

 4.75 



Pounds. 

 71. 1 

 71. 2 

 68. 3 



Pounds. 

 62.6 

 62.9 

 61.3 



Pounds. 



68. ! 

 67. 2 

 66. 3 



Pounds. 

 64. 1 

 62.9 

 63.1 



Pounds. 

 57.2 





56. 2 

 55. 9 





Average. 



70.5 



62. 3 



67. 2 



63. 5 



56.4 



36's 



4.25 

 4.50 

 I. 75 



50. 6 

 50. 1 



IS. 7 



45. 6 

 43.7 

 43.8 



48.6 

 46. S 

 46.4 



44.6 

 11. 

 42. 6 



40.5 





39.9 

 39.8 





Average. 



49.9 



44.4 



47. 3 j 43. 7 



40.1 



M- 



4.25 



3S. 7 



33. 7 ! 36. 3 34. 9 

 33. 9 1 33. 7 ; 33. 8 



32. 8 33. 3 1 33. 1 



25. 2 





4. 50 1 38. 7 

 !. 75 37. 2 



25.9 

 25.6 





Average. 38. 2 



1 



33. 5 34. 4 33. 9 



1 



25.6 



