SPINNING TESTS OF MEADE AND SEA ISLAND COTTONS. 3 



MECHANICAL CONDITIONS. 



All of the test lots were run under the same mechanical conditions 

 except for minor changes in the draft to secure the required weight 

 of sliver. These changes were necessary because the Meade was 

 slightly more wasty than the Sea Island. 



PERCENTAGES OF WASTE. 



Accurate records were kept of the amount of cotton fed to and de- 

 livered by each machine and of the waste discarded at each process. 

 The invisible loss depends upon the grade of the cotton and the 

 atmospheric conditions under which it is being manufactured. To 

 offset the effect of the latter an attempt was made to maintain the 

 relative humidity at 65 per cent, but because of the absence of humid- 

 ifiers in the picker room it was not always possible to keep a constant 

 humidity in that room, which caused slight variations in the invisible 

 loss. 



Table 1 gives the percentages of visible waste obtained at the 

 pickers, cards, and combers; the invisible waste; and the combined 

 visible and invisible waste from both the Meade and Sea Island cot- 

 tons tested. 



Table 1.- 



-Percentages of waste obtained from Meade and Sea Island cotton 

 during the seasons shown. 





1916-17 



1918-19 



1919-20 





Meade 

 cotton. 



Sea 

 Island 

 cotton. 



Meade 

 cotton. 



Sea 

 Island 

 cotton. 



Meade 



cotton, 



sandy 



soil. 



Meade 



cotton, 



clay 



soil. 



Sea 

 Island 

 cotton. 



Visible waste: 



Pickers * 



1.80 



7.66 



22.45 



1.04 



7.04 



23.26 



1.63 



5.70 



19.39 



1.63 



5.32 



15.03 



2.34 

 6.49 



18.85 



3.14 

 10.01 

 16.12 



1.05 



Cards* 



5.03 



Combers 1 



15.20 







Total visible 2 



29.48 

 .74 



29.34 

 .27 



24.82 

 2.12 



20.55 



.74 



25.51 

 2.54 



26.19 

 3.97 



19.79 



Invisible waste 2 



3.63 







Total visible and invisible waste from 

 pickers, cards, and combers 2 



30.22 



29.61 



26.94 



21.29 



28.05 



30.16 



23 42 







1 Based on the net weight fed to the respective machines. 

 1 Based on the net weight fed to the opener picker. 



These waste percentages show that the Meade and Sea Island 

 cotton were practically equal in wastiness for the season of 1916-17, 

 the percentages of visible waste being 29.48 and 29.34, respectively. 

 The tests made on the cotton grown in the season of 1918-19 show 

 that there was 4.27 per cent more visible waste in the Meade than in 

 the Sea Island cotton. This difference was almost entirely due to the 

 waste made on the comber. The tests made on the crop of 191-9-20 

 showed a difference of 5.72 per cent more visible waste for the sandy 

 soil and 6.40 per cent for the clay soil Meade than for the Sea Island. 



