MANUFACTURING TESTS OF COTTON, 5 



same extent — the effects of the fumigation might have been seriously 

 questioned. However, since the two tests at the textile school do not 

 disclose any material difference between these lots it is assumed that 

 the differences shown by the mill tests are the result of technicalities. 



MOISTURE TESTS. 



The results of these tests were substantiated by moisture tests 

 of the fumigated and nonfumigated cotton at the textile school, 

 shown in Table III. The results of these tests indicate that the 

 fumigation had no appreciable effect on the absorptive properties 

 of the cotton. 



Tablk III.- 



-Percentages of moisture in the cotton while in the manufacturing 

 processes. 





Lot No. 2. 



DiflEer- 

 ence. 



Process. 



Fumi- 

 gated. 



Nonfu- 

 migated. 





8.10 

 8.09 

 6.55 

 7.08 



7.76 

 7.66 

 7.60 

 7.13 



-1-0.34 





-fO.43 



Card sliver 



-1.05 





-0.05 







SPINNING QUALITIES. 



The numbers of yarn made at the textile school to ascertain the 

 spinning qualities were 40's and 50's from the l|-inch cotton and 

 lO's, 20's, 30's, 40's, 50's, 60's, 80's, and lOO's from the l|-inch cot- 

 ton. Close observations were made by the men who actually were 

 running the machines and also by those supervising the work and 

 no difference was observed in the general spinning qualities. 



TENSILE STRENGTH. 



In order to ascertain the tensile strength comparisons of the dif- 

 ferent lots of fumigated and nonfumigated cotton, a number of bob- 

 bins of the different numbers of yarn were sent from the textile 

 school and the mills to the laboratory of the Office of Markets and 

 Kural Organization of the Department of Agriculture for test 

 purposes. 



These tests were made by reeling off, in skeins of 120 yards each, 

 the same numbers of yarn made from the different lots. The skeins 

 were placed on racks^^ in order to keep them separate and to avoid 

 tangling, after which they were removed one at a time in rotation 

 and broken with a power yarn-tester, the downward stroke of the 

 traverser moving at the rate of approximately 12 inches per minute. 

 Hourly humidity records were taken and the humidifier was regu- 



1 Method originated by Dr. N. A. Cobb, Bureau of riant Industry, U. S. Department of 

 Agriculture. 



