10 



BULLETIN 359^ U. S. DEPAETMEISTT OP AGEICULTUEE. 



Table X. — Average breaking strength in pounds per skein of 120 yards of the differeni 

 numbers ofyo/rn arranged to shoiv comparison according to grade relations. 



[With twist per incli of 3.25 times the square root of the number of yam.] 



Xumbers of yam. 



lO's 



20's 



SO's 



40'S 



50's 



SCs 



lOO's.... 



Average breaking strength. 



Extra 

 Ari- 

 zona. 



352. 66 

 166. 93 

 100. 09 

 66.42 

 50.49 

 25. 34 

 17.07 



111.28 



Fancy 



Sea 

 Island. 



306. 08 

 163. 53 

 101.78 

 74.44 

 53.56 

 27.45 

 20.25 



106.73 



Choice 

 Ari- 

 zona. 



332. 29 

 162. 78 

 96.54 

 67.34 

 49.22 

 25.23 

 17.89 



Extra 

 choice 



Sea 

 Island. 



Good 

 Sakel- 

 laridis. 



Stand- 

 ard Ari- 

 zona. 



320. 14 



341.99.1 



164.29 



168. 54 



97.55 



98.88 



71.56 



71.25 



50.27 



51.84 



25. 25 



24.97 



18.78 



18.14 



-329. 60 

 163. 90 

 96.88 

 70.11 

 48.34 

 23.87 

 17.96 



107.33 106.83 j 110.80 J 107.24 



Fully 



good 



fair 



Sakel- 



laridis. 



330. 43 

 166. 10 

 100. 41 

 72.19 

 50.79 

 24.26 

 18.56 



108. 96 



Me- 

 dium 



Ari- 

 zona. 



314. 37 

 160. 09 

 95.89 

 68.18 

 48.62 

 23.66 

 17.34 



Fair 

 Sakel- 

 laridis. 



301.24 

 160. 18 

 96.44 

 69.57 

 48. 78 

 23.66 

 15.24 



104.02 



102. 16 



Table XI. — Average breaking strength in pounds per skein of 120 yards of the different 

 numbers of yarn arranged to shovj comparison according to grade relations. 



[With tvrist per inch of 3.8 times the square root of the number of yarn.] 



Numljers of yam. 



Extra 

 Ari- 

 zona. 



Fancy 



Sea' 



Island. 



Choice 

 Ari- 

 zona. 



Extra 

 choice 



Sea 

 Island. 



Good 

 Sakel- 

 laridis. 



Stand- 

 :ard Ari- 

 zona. 



Fully 



good 



fair 



Sakel- 



laridis. 



i 

 Me- 

 dium 

 Ari- 

 zona. 



Fair 

 Sakel-, 

 laridis. 



30's 



98.29 

 73.43 

 48. 30 

 39. 63 

 24.42 

 17.82 



99.39 

 72.70 

 50.98 

 41. 93 

 26.25 

 20.24 



93.66 

 70. 13 

 49.00 

 .39. 11 

 24.15 

 18.00 



100.74 

 70.17 

 47.96 

 38.78 

 24.41 

 18.48 



102. 11 

 73.04 

 52.-39 

 41.25 

 25. 14 

 18.08 



1 



96.40 

 70.12 

 48.03 

 39.45 

 23.62 

 17.81 



98.43 

 72.23 

 48.89 

 39.49 

 24.33 

 18.61 



96.11 

 67.21 

 47.78 

 39.06 

 23.38 

 I 17. 23 



95. 51 



40's 



68.72 



SO's 



4S.41 



60's 



39.09 



80's 



23.02 



lOO's 



16.82 



Average breaking strength 



SO. 31 



51.92 



49.01 



50.09 



52.00 j 49.24 



50.33 



1 48.46 j 48.59 



A careful analysis of these tensile strength tables discloses the 

 fact that if comparisons of each kind of cotton and each number 

 of yarn are made, the yarns ma^nufactured from the Sakellaridis 

 Egyptian cotton were proportionately stronger in the greatest num- 

 ber of cases, the yarns made from the Sea Island ranked second, 

 while those made from Arizona-Egyptian cotton were lowest in ten- 

 sile strength. There were, however, considerable variations, showing 

 that first one kind of cotton and then another was superior in breaking 

 strength on the different numbers of yarn. These variations might be 

 taken as indications that each different kind of cotton is best adapted 

 to certain numbers of yarn. It seems more probable, however, that 

 these small differences would exist naturally in the manufacture of 

 any two lots of cotton of even the same kind. The average of the 

 tensile strength of all the different numbers of yarn with 3.25 as 

 twist constant compared according to the grade arrangements given 

 in Table X shows that in two cases out of four Arizona-Egyptian 

 is the strongest, and in two cases SakeUaridis is the strongest. The 

 average tensile strength of all the diiTerent numbers of yarn with 

 twist constant of 3. SO as sho^vn m Table XI shows that Sea Island is 

 stronsrest m one case and Sakellaridis in three cases. 



