1 66 SCIENCE OF SUCCESSFUL THRESHING. 



from the heads or tops of the plant is usually called "hull- 

 ing," instead of "threshing." A special attachment is made 

 for "Case" separators, for use in hulling clover. This 

 attachment consists of four narrow three-row concaves 

 filled with corrugated teeth, one special blank concave and 

 special sieves. All twelve rows of teeth should be used and 

 the blank placed in front. If the seed be not threshed clean 

 from the heads at the regular speed, with the twelve rows 

 of teeth set clear up, run the cylinder a little faster. While 

 doing this, the belts driving beater, crank and fan may be 

 left a little loose so they will not drive these parts too fast. 

 Clover must be very dry to be well threshed by any machine 

 and when threshing from the field is usually not in condi- 

 tion to be hulled before ten or eleven o'clock in the morning. 

 From three to six bushels per hour is fair work with a 

 medium size separator in dry clover of an average yield. 

 The machines built especially for hulling clover have only 

 about half the capacity of the "Case" separator. 



Good cleaning has been done with the adjustable-sieves 

 alone, but ordinarily, it will be found much easier to pro- 

 duce clean seed if a sieve be useid in the shoe below the 

 adjustable one. For this purpose, the three-thirty-seconds- 

 inch round-hole sieve, N, or the twelve by twelve mesh 

 woven-wire-sieve, R, is the correct size. Either should be 

 placed in the seventh notch and eighth hole. The adjust- 

 able shoe-sieve should be placed in the second notch and 

 third hole. When common sieves are used, the three-quar- 



