8 BULLETIN 1184, U. S. DEPARTMENT OF AGRICULTURE. 
from Pima are more uneven : that is. they vary more in diameter 
than yarns made from Sakellaridis or Sea Island cotton. It will 
be noted in Plate II. however, that Pima yarns are as smooth as 
Sakellaridis yarns. 
In comparative spinning tests of Pima and Sakellaridis cotton 
conducted by the Bureau of Markets and Crop Estimates of the 
United States Department of Agriculture in December. 10-21. the 
results shown in Table 3 were obtained. 
Table 3. — Results slioicn in comparative spinning tests of Pima and Sakellaridis 
cotton conducted bn the Bureau of Markets and Crop Estimate* in December, 
1921. 
[The percentages of visible waste are based on the net weight fed to the respective ma- 
chines, except as stated. The breaking strengths (shown in pounds per skein of 120 
yards) have been corrected for the variation in the numbers or sizings of the yarns.] 
Machines. 
Visible waste: 
Pickers:.. . 
Total visible. 
Kinds of waste. 
f Opener-breaker motes and fly. 
\Finisher motes and fly 
I Flat strips 
Cylinder and doffer strips. 
Motes and fly 
Sweepings 
Total visible. 
Combers 
Pickers, cards, and combers 
Comber waste. 
Total visible.. 
Pima 
cotton 
(per cent). 
0.84 
.31 
1.27 
.97 
.19 
14.05 
20.30 
No. of yarn. 
Draper 
standard 
for combed 
warp yarns 
(pounds). 
Twist 
multiplier. 
Pima 
(pounds). 
Breaking strength of yarn: 
23s.... 
109 
f 3. 2 
3. 5 
I 3.8 
139. i 
142.0 
134.3 
138.5 
22 
f 3.2 
\ 2.5 
[ 3.8 
100s 
20.5 
20.7 
20.2 
20.5 
1 Percentage based on the net weight fed to the bale breaker. 
The production of card was 295 pounds per 48 hours. The yarn 
was spun on lj-inch rings and tested under an automatically con- 
trolled relative humidity of 65 per cent. 
(3). Pima yarns are said not to retain strength as compared with 
Sakellaridis when put into ply yarns. Tests reported under date 
of May 2, 1918. by the Bureau* of Markets of the United States De- 
partment of Agriculture gave the results shown in Table 4. 
The yarns were tested for strength on a single strand tester, and 
the total stretch of the yarn was taken at the breaking point. 
