THE CLEANING APPARATUS 



grain lost, they would not attach so much importance to 

 the small amount ordinarily wasted. 



However, it is true that any separator will waste con- 

 siderable grain if improperly operated. When there is 

 reason to believe that a machine is wasting more than it 

 should, first determine whether the grain is being carried 

 over in the chaff or in the straw. 



// the Waste be at the Shoe, catch some of the chaff 

 from the conveyor sieve and if grain be found, see that the 

 sieve is properly adjusted for the kind of grain being 

 threshed. If a common sieve be used, it should be coarse 

 enough for the grain and its lips should be sufficiently bent 

 open. Too high a speed will cause grain to be carried over 

 the conveyor sieve. Do not use any more concave teeth 

 than are necessary as the extra amount of chaff makes 

 difficult work for the sieves. See that the blinds are ad- 

 justed so that the blast is no stronger than is necessary to 

 clean the grain and keep the sieves working freely. If 

 grain be still detected, open the adjustable conveyor sieve 

 a little more. It should not be opened so much, however, 

 as to overload the shoe sieve. The wind-board should 

 throw the strongest blast about half way back on the con- 

 veyor sieve. Carrying "traps" in the fan drum is liable 

 to bend down this board which in some cases becomes so 

 sagged that some kernels slide over it into the fan, are 

 struck by the fan wings and thrown entirely out of the 

 machin<v 



