550 



THE SMALL GRAINS 



movement of grain through the mill, is called a " flow 

 sheet." The wheat cleaning processes are omitted for sim- 

 plicity. The number of breaks and crushes and the number 

 and arrangement of sifters, purifiers, reels, and dusters will 

 vary in different mills. Following the diagram, in which 

 the course of the grain is shown by continuous lines of 

 arrows, it is seen that the grain is first crushed between 

 the first break rolls (having in this case motions of 450 



FIG. 169. Sketch showing the principal steps in the gradual reduction 

 of wheat to flour. 



and 380 revolutions a minute), and then falls on a sifter 

 with 3 sieves. The first sieve is of coarse wire No. 16. 

 The material passing over this sieve goes to the second 

 break. That which passes through falls on a finer wire, 

 over which passes the germ and some other materials; 

 while that which passes through falls on a No. 10 silk 

 cloth, over which passes the " sharps " for regrinding in 

 the first crush. That which passes through No. 10 is 



