l86 SCIENCE OF SUCCESSFUL THRESHING 



easy to thresh them very fast and a machine of medium 

 size often turns out as much as six or seven hundred 

 bushels per hour. When damp, however, oat-straw is very 

 tough and requires a speed of fully 750 for the twenty-bar 

 or 1075 for the twelve-bar cylinder. The adjustable-chaf- 

 fer and shoe-sieve should be opened more than for wheat. 

 If the separator be equipped with common sieves, the two- 

 inch lip-sieve, D, should be used as a chaffer and the three- 

 quarter inch lip-sieve, F, placed in the second notch and 

 third hole in the shoe. If this sieve be found too fine, as 

 is occasionally the case with large oats, and in fast thresh- 

 ing, the one and one-quarter inch lip-sieve, E, may be 

 used in the shoe. Any 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 cleaning. Oats that are poorly 

 filled, 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 nothing. 



Threshing Barley. In certain localities, sometimes 

 barley 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 



