10 BULLETIN 788, U. S. DEPAKTMENT OF AGRICULTURE. 



break streams adds weight to this conclusion, especially since it is 

 true that the streams coming from the break roUs are composed of 

 particles differing greatly in size and character, thereby making it 

 difficult to secure a representative sample, or to divide it, for the 

 purpose of moisture determination, into smaller portions composed 

 of the different sizes and character of particles in their proper pro- 

 portion. 



MOISTURE CONTENT OP DIFFERENT FLOUR STREAMS. 



Part 3 of Table II shows the percentage of moisture contained in 

 the flour produced by the different grinding, or reduction, operations 

 indicated in part 2. 



In practically all mills it is the practice to combine streams of 

 small quantity and similar quality coming from different grinding 

 operations before a separation of the flour product is made. The 

 moisture percentages in some of the instances given here represent 

 the moisture content of the flour product of combined streams, a fact 

 which accounts for some of the apparent omissions and inconsisten- 

 cies in the table. 



Probably the most interesting thing to note from the data given in 

 part 3, as in the case of the data of part 2, is the reduction of the 

 moisture content of the flour streams as the miUing proceeded from 

 first break to the end of the process, the break streams being 

 highest and the low grade streams lowest. This point is illustrated 

 more clearly by the curves shown in figure 2. 



The flour streams resulting from the break stock of mills Nos. 1 

 and 3 showed a considerably higher moisture content than did those 

 from the sizings, middlings, tailings, or low grade stock. The mois- 

 ture content of the break flour of mill No. 2, on the other hand, did 

 not appreciably differ from that of the sizings and middlings flour. 

 This may have been due to the little difference in moisture content 

 .among the break, sizings, and middlings roll streams. 



Examination of parts 2 and 3 of Table II shows, except with respect 

 to the break flour product of mills Nos. 1 and 3, a close correspondence 

 between the moisture content of the flour product and that of the roll 

 stream from which it was derived. The moisture content of the 

 different break flour streams of mills Nos. 1 and 3, although higher 

 than that of their middlings and sizings flour was, in some instances, 

 as much as 2 per cent lower than that of the break roll streams from 

 which they were produced. 



MOISTURE CONTENT AND YIELD OF MILL PRODUCTS. 



Part 4 of Table 2 shows the percentage of moisture contained in the 

 different commercial products of each mill together with the percent- 

 age of yield of each. The milling yields given here are based upon 

 the actual weights of the products milled during a test run made 



