COMPARATIVE SPINNING TESTS. 



13 



The above standards consist of set No. 1, a range of yellow tints; 

 set No. 2, a range of blue tints; and set No. 3, a range of red tints. 

 The better the bleach obtained, the less yeUow would be apparent, 

 hence such samples would find their match in set No. 2 or No. 3. In 

 each set there were 10 standards, varying with regular increasing 

 intensity of tint, the higher numbers having the highest color. 

 Hence from the above tables it will be seen that the Arizona-Egyptian 

 in case of samples No. 1 and No. 4 gave shades equal to the true 

 Egyptian, and in the case of samples No. 2 and No. 3 gave shades 

 equal to the best obtained on the Sea Island. 



BLEACHING YARNS. 



Yarns made from the cotton designated No. 1 to 9 (p. 11) were 

 used in the bleaching tests. The bleaching of these yarns was carried 

 on according to methods (A) and (B). The whites obtained were 

 matched against the standards with the results given in Table XIII. 

 This table shows that with either method of bleaching, better whites 

 were obtained with the Arizona-Egyptian and Sea Island than with 

 the SakeUaridis. 



Table XIII. — Bleached yarns matched against a series of standard whites. 







Arizona-E gyptian. 



Sea Island. 



SakeUaridis. 





1 



2 



3 



4 



5 



6 



7 



8 



9 



(A) 



Set 



3 



7 



3 

 6 



3 



7 



3 

 6 



3 



7 



3 

 6 



3 



7 



3 

 6 



3 



7 



3 

 6 



3 



7 



3 

 6 



3 

 6 



3 



4 



3 

 6 



3 

 4 





3 



Standard... . . 



n 



(B) 



Set 



3 



Standard ... . . 



4 









In the laboratory tests, the deviations in the numbers were stand- 

 ardized on the basis of the average number of the gray, the bleached, 

 and the mercerized, respectively. When the tensile strength of the 

 gray yarn was compared with the results obtained in the laboratory, 

 yarn from the same bobbins was used in each case. From these 

 bobbins 60 yards instead of 120 yards per skein were used. (See foot- 

 note 1, p. 8.) 



The tensile strength of 80/2 yarns of each of the nine kinds was 

 taken before and after bleaching with methods (A) and (B). The 

 results of these tests are shown in Table XIV. 



