198 SCIENCE OF SUCCESSFUL THRESHING 



cylinder pinion 24 teeth (Wood) run the cylinder 603 r. 

 p. ra. when the tumbling rod makes 182 r. p. m. Pulleys 

 except 5369T same as for Rice 20-bar separators (belt). 



Hulling Clover. The process of removing clover seed 

 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, 

 and use pulley 5582T (for 2O-bar) to drive beater, crank 

 and fan at the normal speed. 



As the clover is chopped very fine, the work can often 

 be improved by adding slats to the straw rack, making 

 it similar to the Oregon rack. 



Clover must be very dry to be well threshed by any 

 machine and when threshing from the field is usually not 

 in condition to be hulled before ten or eleven o'clock in the 

 morning, or until the effects of the dew have entirely dis- 

 appeared. From three to six bushels per hour is fair work 

 .with a medium size separator in dry clover of an average 

 yield. A clover yield, however, is an extremely variable 

 quantity. 



Good cleaning has been done with the adjustable-sieves 

 alone, but ordinarily, it will be found much easier to clean 

 the seed well if a sieve be used in the shoe below the 



