14 BULLETIN 359, U. S. DEPARTMENT OF AGRICULTURE. 
Table XIV. — Tensile strength before and after bleaching. 
Gray. 
Bleach A. 
Bleach B. 
Sample number. 
Num- 
ber of 
yarn. 
Tensile strength. 
Num- 
ber of 
yarn. 
Tensile strength. 
Num- 
ber of 
yarn. 
Tensile strength. 
Pounds 
per skein 
(60 
yards). 
Ounces 
per 
smgle 
thread. 
Pounds 
per skein 
(60 
yards). 
Ounces 
per 
single 
thread. 
Pounds 
per skein 
(60 
yards). 
Ounces 
per 
single 
thread. 
1 
42.3 
42.3 
42.3 
42.3 
42.3 
42.3 
42.3 
42.3 
42.3 
37.9 
34.8 
36.2 
34.3 
38.2 
35.1 
37.7 
36.0 
32.5 
8.7 
8.5 
8.2 
7.9 
9.0 
8.4 
8.4 
8.6 
8.2 
46.4 
46.4 
46.4 
46.4 
46.4 
46.4 
46.4 
46.4 
46.4 
31.1 
26.7 
28.8 
28.5 
29.7 
27.2 
31.7 
33.8 
28.3 
7.0 
7.3 
7.1 
7.1 
6.9 
6.7 
7.4 
8.3 
7.8 
47.0 
47.0 
47.0 
47.0 
47.0 
47.0 
47.0 
47.0 
47.0 
34.6 
8.3 
2 
3 
33.0 
31.0 
38.8 
28.0 
37.0 
29.5 
34.0 
8.4 
4 
8.6 
5 
8.7 
6 
7.0 
7 
8.2 
8 
8.8 
9 
7.9 
42.3 
42.3 
42.3 
42.3 
35.8 
35.8 
36.6 
35.4 
8.4 
8.3 
8.7 
8.4 
46.4 
46.4 
46.4 
46.4 
29.5 
28.8 
28.4 
31.3 
7.3 
7.1 
6.8 
7.8 
47.0 
47.0 
47.0 
47.0 
33.2 
32.9 
33.4 
33.5 
8.2 
8.4 
7.9 
8.3 
A comparison of the figures in Table XIV shows that the Arizona- 
Egyptian cotton was slightly weaker in the gray than the average 
of all, and that the Sea Island was stronger than the average of all. 
When bleached according to method (A) the Arizona-Egyptian was 
also weaker than the average and the Sakellaridis stronger. When 
bleached according to method (B) the Arizona-Egyptian was the 
weakest and the Sea Island the strongest. These deviations from, 
the average strength, however, are not greater than the variations 
found between the several tests on the same yarn. Hence, this table 
of averages does not indicate a very serious variation in the strength. 
DYEING. 
Samples of the yarns were bleached according to method (B), but 
not blued. These samples were dyed pink and blue by the methods 
given below for direct and basic dyes. The results of these tests 
indicated no appreciable difference in the dying values of the nine 
cottons tested. The two methods are as follows : 
Direct dyes. — The yarns were dyed hi a bath containing a 0.1 per 
cent benzo rhoduline red B, 5 per cent of salt, and a 0,5 per cent 
soluble oil. The volume of dye bath equaled 25 times the weight of 
the goods. The goods entered the dye bath cold, and the tempera- 
ture was raised to the boiling point in 30 minutes. They were boiled 
15 minutes and allowed to cool in the bath 15 minutes. The light 
blue was dyed in the same manner, except that a 0.1 per cent benzo 
fast blue B N was used instead of the benzo rhoduline red B. 
Basic dyes. — The goods were mordanted in a solution containing 
0.015 of a gram of tannic acid in each 100 cc. The goods were entered 
cold; the temperature of the bath was raised to 190° in 45 minutes; 
it then was allowed to cool over night, rinsed and treated cold for 
15 minutes in a bath containing 0.01 of a gram of tartar emetic. 
