COMPARATIVE SPINNING TESTS. 7 



Table VI. — Prices of the different grades of each lot of cotton in comparison vjith the 

 percentages of waste discarded. 



[Bales arranged in groups according to the apparent grade relation of the different lots.] 



Price of cotton 



Percentage of waste . 



Arizona 

 extra. 



$0.21 

 17.69 



Island 



fancy. 



$0. 21J 

 23.42 



Arizona 

 choice. 



$0.20J 



18.56 



Sea 

 Island 

 extra 

 choice. 



$0. 2frJ 

 23.05 



Sakel- 

 laridis 

 good. 



M.21§ 

 25.36 



Arizona 

 stand- 

 ard. 



SO.lOi 

 20.00 



Sakel- 

 laridis 



fully 

 good 



fair. 



$0.20J 

 26.38 



Arizona 

 me- 

 dium. 



$0.18 

 20.90 



Sakel- 



laridis 



fair. 



$0. 19f 

 27.97 



It should be borne in mind that all the cotton represented as waste 

 is not actually lost, but the greater part of it is reworked in the 

 manufacture of cheaper goods. 





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Fig. 1.— Progressive waste percentages of Arizona-Egyptian, Sea Island, and Sakellaridis Egyptian 



cottons. 



TENSILE STRENGTH COMPARISONS. 



In order to ascertain the difference m tensile strength between the 

 grades of Arizona-Egyptian cotton and between Arizona-Egyptian, 

 Sakellaridis Egyptian, and Sea-Island cottons, there were manu- 

 factured from each of these the following numbers of yarn: lO's, 

 20's, 30's, 40's, 50's, 60's, 80's, and lOO's. The slight variations in 

 the numbers of yarn were standardized on a weight basis. A portion 

 of this cotton yarn was spun with two twist constants,^ viz, 3.25 and 

 3.80. 



1 Multiply the square root of the number of yam by the constant to find the turns per inch of twist inserted 

 in the yam while spinning. 



