I5O SCIENCE OF SUCCESSFUL THRESHING. 



is started around the upper sprocket, pull the rope from 

 below and feed it in as before to bring it to its proper place. 

 Hook the chain at bottom, see that it is on the sprocket, and 

 tighten by means of adjusting screws at the top. Turn the 

 pulley at top of elevator by hand until the chain has gone 

 once around to insure its being free from kinks. 



The Tailings are a good indication of the work the sieves 

 are doing. They should be small in amount and contain no 

 light chaff and very little plump grain. If too much good 

 grain be returned with the tailings, ascertain if it comes over 

 the shoe sieve or through the conveyor extension. If it be 

 passing over the shoe sieve, probably this sieve is overloaded 

 with chaff, as is sometimes the case when the straw is badly 

 cut up. To remedy this, the conveyor sieve should be partly 

 closed to let less straw through. If, however, the good 

 grain is going over the conveyor sieve and through the con- 

 veyor extension, the remedy is just the reverse, that is, the 

 conveyor sieve should be opened. The adjustment in sep- 

 arators with lip sieves is made by bending the lips, but as a 

 usual thing, they should be set at about a forty-five degree 

 angle. Grain returned in the tailings is apt to be cracked 

 by the cylinder, and when the tailings are heavy this is some- 

 times of importance. If very much chaff is returned it in- 

 creases the difficulties of separation, and must be handled by 

 the sieves again. In all cases have as few tailings as possible* 



