SCIENCE OF THRESHING. 63 



sieve with too small meshes, thus causing it to pass 

 over the tailings spout and increasing the impedance 

 of the blast. Some kinds of flax have larger seed 

 than do others, and this must be remembered in 

 adjusting the mill. 



In fast flax threshing, the most satisfactory work 

 can be done by using a finishing sieve (of perforated 

 sheet metal, not wire) having meshes three-sixteenths 

 of an inch across. 



