﻿SPINNING TESTS OF COTTON. 



11 



Referring to Table 8 and comparing the breaking strength of 

 the yarn spun from the cotton of the different types of bales, 

 it is seen that the strongest results were obtained from the 

 standard bale, followed in order by the high density bale, flat bale, 

 and round bale. 



All the 16's and 22's yarn broke stronger than the new Draper 

 standard. All the 28's yarn, with the exception of that spun from 

 the round bale, broke practically as strong as the standard strength 

 for this number. The 36's yarn spun from all the types of bales was 

 weaker than the standard strength for this number. 



On an average, the yarns spun from the round bale were about 

 7 per cent weaker than the yarns spun from the other types. 



IRREGULARITY OF YARNS. 



The following figures give the irregularity of the sizings and break- 

 ing strengths of the yarns from the different types of bales : 



Sizing Break 

 (per cent), (per cent). 



Flat bale 1.98 4.15 



Standard or railroad compressed bale 1. 93 3. 87 



High-density bale 1.91 3.97 



Round bale : 2.22 4.66 



These figures indicate that there is practically no difference in the 

 irregularity of the sizings or strengths of the yarn spun from the 

 first three types of bales but the yarn from the round bale was 

 slightly more uneven. 



The results of the calculations of the irregularity of the yarns 

 are verified by tests on the Moscrop single-strand tester. Figure 

 2 is a photograph of a chart made by this tester when break- 

 ing 22's yarn spun from the Rowden cotton compressed to different 

 densities. 



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Fig. 2.— Irregularity of 22's yarn spun from Rowden 1" cotton compressed to different densities. 



Each dot of figure 2 represents the breaking strength of a single 

 strand of yarn 12 inches long. The greater the distance these dots 

 are from a horizontal line, the more irregular the yarn. 



Plate IV, Figure 2, is from a photograph of 22's yarn spun from the 

 Rowden cotton which shows practically no difference in the quality 

 of the yarn spun from the different types of bales. 



