('» 



BULLETIN 288, IT. S. DEPARTMENT OF AGRICULTURE. 



showing ill round numbers about how much mixing may occur. 

 Each roll contains from 35 to 40 pounds of seed, or slightly more 

 than a bushel. The four rolls in a 4-gin battery therefore would 

 contain from 140 to 160 pounds, or from 4 to 5 bushels of seed. 

 If most of these passed out of the roll boxes during the ginning 

 of a bale of cotton, as is indicated by the results at hand, they would 

 comprise from 14 to 16 per cent by weight of the total quantity 

 (about 1,000 pounds) of seed usually obtained by the patron from 

 the seed cotton necessary to make a bale of lint. 



While such an admixture in itself is sufficient to justify a demand 

 for more care than is ordinarily exercised at custom gins, it must 

 be remembered that the roll box is not the only source of mixture 

 at the gin. 







i 



J r J's* 



m^m 



■3iM&* k%'V*- ' All- V ■ "^?v. MjM iJjr 



Fig. 5.— Sample of cotton seed taken 25 minutes after the ginning of the second hale had hegun, showing 

 0.5 per cent of red seed from the stained roll of the first hale. 



OTHER SOURCES OF MIXTURE. 



It has already been pointed out that some mixing may occur before 

 the seed cotton reaches the roll box, and also that further mixing 

 occurs in the seed conveyor. While it is impossible to determine the 

 amount of mixing which may occur in the flues, it may be measured 

 in the seed conveyor by a continuation of the method employed in 

 making determinations in the roll box. 



Such determinations were not made at Greenville, but it was ob- 

 served that even after the second bale was ginned red seeds were 

 found scattered along the conveyor from the gin to the seed house. 

 Thus, while the seed was badly mixed before it was delivered into the 

 conveyor, it was mixed more and more thorouglily as it was stirred and 

 crowded forward by the conveyor screw. For this reason it is appar- 

 ent that the amount of mixture in the seed delivered to the patron is 

 even greater than is indicated by the determinations made at the gin. 



