2OO SCIENCE OF SUCCESSFUL THRESHING 



govern the hulling of clover apply in a general way to 

 the threshing of alfalfa, although it is easier to rub the 

 latter out of its pods than the former out of its heads. The 

 clover concaves are sometimes used, but oftener one or 

 more of the regular three-row concaves filled with cor- 

 rugated teeth are all that is required. The sieves may be 

 the same and set in the same way as for clover. Often 

 a weed known as dodder or love-vine, grows with alfalfa 

 and its seeds are usually enough smaller than the alfalfa 

 seed to allow the greater part of them to be removed by 

 screening. The screen best adapted for this purpose is the 

 one-twentieth-inch round-hole, X. 



Threshing Timothy. Although this seed when prop- 

 erly ripened and cured, is not hard to thresh, it is often in 

 such condition as to render it very difficult for the separator 

 to handle. It is often cut and stacked when green or damp. 

 When in this condition, the bundles are very solid and they 

 must be properly fed or the cylinder and concave teeth 

 may give trouble. The speed, too, must be fully up to the 

 normal, 750 for the twenty-bar or 1075 f r tne twelve-bar 

 cylinder. Six rows of concave-teeth should always be 

 used, as considerable rubbing is necessary to loosen the 

 seed from the heads. When the seed is ripe and dry, the 

 cylinder speed may be lowered considerably, and this 

 should be done whenever possible, as a low speed favors 

 the shoe in handling this small and rather light seed. Often 

 when the seed is well ripened and allowed to stand in the 

 field, especially if in shocks that are not capped, it will be 



