10 
BULLETIN 882, U. S. DEPARTMENT OF AGRICULTURE. 
COMPARATIVE STRENGTH AND STRESS TESTS OF YARNS AND FABRICS. 
The cotton shown in the waste table was spun into 3/80's and 
2/60's yarns, which were mercerized and woven into cloth similar to 
that produced by the mill, according to the specifications of the 
Signal Corps. Tests of the strength and stretch were made in com- 
pliance with specifications given above, with the results shown in the 
tables which follow. The results on breaking strength for both gray 
and mercerized yarns are shown in Table 4. 
Table 4. — Breaking strength of 80's, 3/80's, 60's. and 2/60's gray and mercerized 
yarns. 
[ Twist multiple of -1 used in single and ply yarn.] 
8U's 
gray. 
3/80's 
gray. 
3/80's 
mercer- 
ized. 
60's 
2/60's 
gray. 
gray. 
Pounds. 
Pounds. 
47.9 
118.5 
49.5 
131.1 
46.2 
124.8 
43.8 
112.1 
2/60's 
mercer- 
ized. 
American Egyptian No. 1 (fancy) 
Sakellaridis high grade ! 
Sakellaridis lower erade 
Sea Island, 1 bale No. 1 (fancy). 2 bales j 
No. 2 (extra choice), 2 bales No. 3 i 
(choice) i 
Pounds. 
28.2 
30.6 
28.3 
Pounds. 
142.4 
153.1 
144.7 
137. 
Pounds. 
138.1 
163.5 
148.0 
138.0 
Pounds. 
126.3 
141.6 
136.7 
123.7 
i The figures in this table have been corrected for slight variations in the weight of the yarn. 
It will be noticed from Table 4 that the Sakellaridis cotton showed 
greater strength than either the American Egyptian or the Sea 
Island cotton. In the 3/80's mercerized yarn, the breaking strength 
of the high-grade Sakellaridis was 18.4 per cent greater than that of 
either the American Egyptian or the Sea Island, the latter two being 
equal in strength. In the 2/60's mercerized yarn, the breaking 
strength of the high-grade Sakellaridis was 12.1 per cent greater 
than that of the American Egyptian and 14.4 per cent greater than 
that of the Sea Island. 
The tests on the cloth, results of which are shown in Tables 5 and 6, 
indicated that the strength of the yarns was reflected in the cloth, 
confirming the results previously obtained on the yarns. 
Table 5. — Weight, breaking strength, and stretch of 3/80 
fabric made fr ~ 
and ply yarn.) 
fabric made from mercerized yarn. {Twist multiple of 4 used in the single 
68 by 68, plain-weave 
Ounce 
per 
square 
yard. 
Strength in 
pounds. 
Stretch in inches at different loads. 
3/80's. 
Warp. 
Filling. 
Warp. Filling. 
10 
pounds. 
20 
pounds. 
65 
pounds. 
10 
pounds. 
20 
pounds. 
65 
pounds. 
American Egvptian 
3.90 
3.91 
4.00 
4.00 
75 
86 
83 
78 
84 
90 
89 
89 
0.24 
.37 
.37 
.39 
0.36 
.50 
.53 
.56 
0.67 
.78 
.81 
.88 
0.24 
.15 
.20 
.20 
0.36 
.22 
.28 
.30 
0.66 
Sakellaridis high grade 
Sakellaridis lower grade 
Sea Island 
.43 
.55 
.56 
