10 
BULLETIN 359, U. S. DEPAKTMENT OF AGKICULTTJRE. 
Table X. — Average breaking strength in pounds per skein of 120 yards of the different 
numbers of yarn arranged to show comparison according to grade relations. 
[With twist 
per inch of 3.25 times the square root of the number of yarn.] 
Numbers of yarn. 
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. 
Me- 
dium 
Ari- 
zona. 
Fair 
Sakel- 
laridis. 
10's 
352. 66 
166. 93 
100. 09 
66.42 
50.49 
25.34 
17.07 
306. 08 
163. 53 
101.78 
74.44 
53.56 
27.45 
20. 25 
332. 29 
162. 78 
96.54 
67.34 
49.22 
25.23 
17.89 
320.14 341.99. 
329. 60 
163. 90 
96.88 
70. 11 
48.34 
23.87 
17.96 
• 
330. 43 
166. 10 
100.41 
72.19 
50.79 
24.26 
18.56 
314.37 
160. 09 
95.89 
68.18 
48.62 
23.66 
17.34 
301.24 
20's 
30's 
164. 29 
97.55 
71.56 
50.27 
25.25 
168. 54 
98.88 
71.25 
51.84 
24.97 
160. 18 
96.44 
40's 
69.57 
50's 
48.78 
80's 
23.66 
100's 
18.78 1 18.14 
15.24 
Average breaking strength. 
111.28 
106. 73 
107.33 ! 106.83 j 110.80 1 107.24 
108. 96 
104.02 
. 102. 16 
Table XI. — Average breaking strength in pounds per skein of 120 yards of the different 
numbers of yarn arranged to show comparison according to grade relations. 
[With twist 
per inch 
of 3.8 times the square root of the 
number of yarn.] 
Numbers of yarn. 
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. 
Me- 
dium 
* Ari- 
zona. 
| 
Fair 
Sakel- 
laridis. 
30's 
40's 
98.29 
73. 43 
48.30 
39.63 
24.42 
17.82 
99.39 
72.70 
50. 98 
41.93 
26.26 
20.24 
93.66 
70.13 
49.00 
39.11 
24. 15 
18.00 
100. 74 
70.17 
47.98 
38.78 
24. 41 
18.48 
102. 11 
73.04 
52.39 
41.25 
25. 14 
18. 08 
96.40 
70.12 
48.03 
39.45 
23. 62 
17.81 
98.43 
72.23 
48.89 
39.49 
24. 33 
18.61 
1 96.11 
67. 21 
47.78 
39.06 
23.38 
17. 23 
95.51 
68.72 
50's 
60's 
48.41 
39.09 
80's 
23.02 
100's 
16.82 
Average breaking strength 
50.31 
51.92 
49.01 
50.09 
52.00 
49.24 
50.33 
| 48.46 1 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 manufactured 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, shoYv'ing 
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 Sakellaridis is the strongest. The 
average tensile strength of all the different numbers of yarn with 
twist constant of 3.80 as shown in Table XI shows that Sea Island is 
strongest in one case and Sakellaridis in three cases. 
