CHAPTER VI 



THRESHING WITH A SPECIALLY EQUIPPED 

 SEPARATOR. 



THIS chapter will deal with those crops, the thresh- 

 ing of which requires a change in, or an addition 

 to, a regularly equipped separator. It will include 

 the threshing of peas, beans, rice, clover, alfalfa, timothy, 

 orchard-grass, brome grass, red-top grass, Kafir corn, 

 Indian corn and peanuts. 



Threshing Peas. To prevent cracking the peas, it is 

 necessary to run the cylinder at a very much lower speed 

 than is required for threshing grain. To obtain the best 

 results, the twelve-bar cylinder should ordinarily be run 

 at from 400 to 450 revolutions per minute, but when the 

 peas are thoroughly ripened and dry, a lower speed will 

 be better, 300 revolutions being sufficient, at times. Or- 

 dinarily the twenty-bar cylinder should be run 290 revo- 

 lutions per minute, but this speed may also be reduced to 

 nearly 200 revolutions when the condition of the pods 

 permit. To secure this low cylinder speed and retain the 

 normal motion of the other parts of the machine and to 

 some extent of the engine, it is necessary to change the 

 pulleys on the cylinder shaft. 



The number of concave rows may be two, four or six, 



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