156 SCIENCE OF SUCCESSFUL THRESHING. 



of the screens mentioned for wheat are suitable for oats. 

 Since a bushel of oats weighs only a little more than half as 

 much as a bushel of wheat, less wind must be used in clean- 

 ing. Oats that are poorly rilled, and consequently very light, 

 cannot be well cleaned without blowing over some apparently 

 good kernels. Upon close examination, however, it will be 

 found that very few of these are more than hulls, which 

 contain no meat. 



Threshing Barley. In certain localities, sometimes bar- 

 ley is in such condition that it is easily threshed. At other 

 times, however, the "beards" are tough and difficult to 

 knock off from the kernels. To successfully handle such 

 grain, the cylinder- and concave-teeth should be in excellent 

 order. Any teeth that are badly worn should be replaced 

 by new ones. Six rows of concave-teeth may be required 

 and the cylinder-speed should be kept up to fully 750 revolu- 

 tions for the twenty-bar and 1075 for the twelve-bar cylinder 

 separators. In using these means to remove the beards, the 

 straw being brittle, is apt to be badly cut up and, therefore, 

 gives the cleaning apparatus a great deal of chaff to handle. 

 The adjustable sieves should be set as in threshing wheat. 

 By having the front end of the shoe-sieve high and the rear 

 end low, the kernels with beards adhering to them will be 

 carried to the tailings elevator and returned to the cylinder. 

 Another advantage of placing the sieve in this position lies 

 in the fact that when so placed, it lies across the path of 

 the blast, thus forcing the wind through it. The wind, in 



