SPINNING TESTS OF UPLAND LONG-STAPLE COTTONS. 11 



It is noteworthy that the actual waste obtained was in every case 

 decidedly below the usual mill estimate for this wider setting. The 

 Lewis bale again showed the least waste, while the Columbia and 

 the Delta lost identical percentages. 



Averaging the two Webber bales we have the following showing 

 for the five varieties as compared with the arbitrary commercial 

 or standard expectation of 24 per cent of loss at this, setting. The 

 order of excellence then appears as follows : The Lewis showed an 

 actual loss of 11.85 per cent less than the standard. Columbia and 

 Delta each showed 8.85 per cent less. Webber showed 4.04 per cent 

 and Durango 3.57 per cent less, respectively. 



Compared geographically the Texas bale showed a total waste on 

 the wide setting of 20.43 per cent; the Delta, five bales mixed, lost 

 16.15 per cent; the Carolina staples, four bales averaged, lost 17.05 

 per cent. Special attention is called to the fact that the bale of 

 Columbia which exactly equaled the Delta in this test was one- 

 sixteenth inch shorter cotton than any of the others, save Durango, 

 and must have possessed superior uniformity, else it would have lost 

 more than the longer staples. 



The very slight superiority shown by the Delta over some of the 

 Carolina staples at this wider setting does not offset the much greater 

 superiority of the Carolinas over the Deltas at the 13 to 15 per cent 

 setting, the latter being more frequently vised in actual mill work. 



NUMBER AND UNIFORMITY OF TESTS. 



A study of the large number of percentage tests and weighings 

 made on each variety, as shown in Table VI, ranging from 17 on 

 Lewis to 30 on Webber No. 1, shows conclusively that at no time 

 during the run on any bale was the variation sufficient to 'cause any 

 uncertainty as to the amount of short fiber contained in the sample. 

 The widest variation between any two weighings on the same variety 

 is found in the Durango, namely, 1.48 per cent. In the Delta the 

 widest variation was 1.43 per cent. Even under the most ideal con- 

 ditions the machinery builders never claim for their combers less 

 than about 2 per cent variation for different runs on the same cotton, 

 even on the best Peelers and Egyptians. It appears, therefore, that 

 e&ch of the varieties tested was practically uniform throughout the 

 entire run made upon it, such variation as occurred being within 

 the limits of error of the machine. The weighings or tests were 

 made at intervals of 10 to 20 minutes during a two to three day run 

 on each bale. 



