6 



BULLETIN 366, V. S. DEPAETMEXT OF AGRTCULTUEE. 



lated accordingly in order to maintain as nearly as possible a con- 

 stant relative humidity of 65 per cent. 



Table IV gives the results of the tensile-strength tests. 



Lots Nos. 1 and 2, respectively, represent the two lots of l|-inch 

 and l-|-inch Egyptian cotton manufactured at the textile school, 

 vrhile Nos. 3, 4, 5, 6, and 7 represent five lots of cotton, each manu- 

 factured by a different representative manufacturing company. The 

 small variations in the various numbers of yam v^ere standardized 

 for comparison. The differences in tensile strength, in some in- 

 stances, were in favor of the fumigated and, in some instances, in 

 favor of the nonfumigated cotton. 



Table IV. — Tensile strength comparisons. 

 (Made in Yam Testing Laboratory of the United States Depaitment of Agriculture.) 





Lot Xo. 1. 



Lot No. 2. 



Lot No. 3. 



Lot No. 4. 



Lot No. 5. 



Lot No. 6. 



Lot No. 7. 





Breaking 



Breaking 



Breaking 



Breaking 



Breaking 



Breaking 



Breaking 





strength in 



strength in 



strength in 



strength in 



strength in 



strength in 



strength ui 





pounds per 



pounds per 



pounds per 



pounds per 



riounds per 



pounds per 



pounds per 





skein of 120 



skem of 120 



skein of 120 



skein of 120 



skein of 120 



skein of 120 



skein of 120 



Number of 



yards. 



yards. 



yards. 



yards. 



yards. 



yards. 



yards. 



yarn. 





















'd 





'S 





'^~. 





'6 





■d 





-d 





-3 

































































-a 



a 



V, 



a 



-% 



& 



■d 



a 



-3 



■a 



?. 





■3 



a 







1 



8> 



a 



1 



a 



a 



3 



c3 



a 



3 



a 



3 



1 



a 



3 





^ 



Vi 



a 



el 



R 



a 



a 



a 



n 



a 



"a 



3 





D 





3 





3 





S 





3 



O 



3 



o 



3 



o 





f^ 



^ 



f^ 



iz; 



f=H 



■A 



^ 



Z 



&H 



z; 



5h 



iz; 



P=f 



Z 



lo's .... 











302. 11 



303.9 



















20's 



























108.48:102.76 



22's 



















102. 30 



106. 45 







115.38illo.48 



40's 



39.98 

 27.28 



37.56 

 27. 3.5 

























60's. 



























55's 













27.51 



28.20 

































24.88 



26.05 







80's. 







26.45 



28.05 



















84's 











8.32 



7.66 









































Table V. — Tensile strength comparisons. 

 [Made by two representative cotton mills.] 



Number of yarn. 



Lot No. 3— Break- 

 ing strength in 

 pounds per skein 

 of 120 yards. 



Lot No. 4— Break- 

 ing strength in 

 poimds per skein 

 of 120 yards. 





Fumi- 

 gated. 



Nonfu- 

 migated. 



Fumi- 

 gated. 



Nonfu- 

 migated. 



27's 



114.8 



112. 8 







57's 



30. 25 



.30.00 



i 







It will be- observed that in lot No. 3 the fumigated cotton produced 

 the stronger yarn; in lot No. 4 the reverse was true. 



SINGLE-THREAD TEST. 



In addition to the tests sIioavd in Table IV several tests were made 

 Avith a single-thread testing machine.^ The results of these tests are 



1 These strength tests were made by William Smith, professor in charge of the carding 

 and spinning department of the New Bfdford Teslile School, New Bedford, Mass. 



