THRESHING WITH REGULARLY EQUIPPED SEPARATOR 189 



separators, fitted only with the adjustable sieves. Usually, 

 however, it is necessary to place a sieve underneath the 

 adjustable shoe-sieve to do first-class cleaning-. The ad- 

 justable sieve should be placed as high as possible at both 

 ends in the shoe. For a lower sieve, the five-thirty-sec- 

 onds-inch round hole sieve, I, is the correct size. It should 

 be placed in the seventh notch at the fan end and the fourth 

 hole in the rear. This sieve should also be used in the 

 same position in the shoe of machines fitted with common 

 sieves. For an upper sieve, either of the wheat sieves may 

 be used, but the three-eighths-inch lip sieve, G, is prefer- 

 able to the fifteen-sixty-fourths-inch round hole sieve, H. 

 For a chaffer, the three-quarter-inch lip-sieve, F, works 

 the best of the common sieves. More wind can be used 

 with two sieves in the shoe than with one. 



Any of the smaller round hole sieves may be used as 

 a screen, the particular one being determined by the kind 

 of weed seed to be removed and other local conditions. 

 Usually the three-thirty-second-inch round hole, N, is 

 suitable. 



Threshing Buckwheat. This grain is easily knocked 

 off the straw and even one row of concave teeth is seldom 

 necessary. In most cases it will be found advisable to sub- 

 stitute a hard wood board for each concave. The grain 

 in being thrown by the cylinder from one board to another 

 is generally well knocked loose without breaking either 

 grain or straw to any extent. Buckwheat straw is brittle 



