772 THE COMPLETE GRAZIER. BOOK VHI. 



with fine chaff, commonly called cob ; this is put into the rubber, and 

 rubbed out by being worked through a concave by means of helically- 

 placed bars, something like bicycle tires fixed by a skeleton frame to a 

 spindle running through the centre; these fit close to the concave and 

 rub the seed out as they revolve. The motion draws the cob to the 

 outside of the concave, but until recent years a solid worm was used. 

 Kecently the several makers have very much improved the sifting 

 arrangements, whereby a much greater amount of work can be done. 



Fig. 339. Innes & Co.'s Stacking Machine, OP Elevator. 



In fig. 337 a chaff-cutter is represented as working behind a threshing 

 machine. The straw falls from the shakers to the feeding platform of 

 the chaff-cutter ; whereby all yelming or handling of the straw, except 

 by the feeder, is avoided, with great saving of expense. The chaff- 

 cutter is driven from a strap fixed to the main pulley of the threshing 

 drum, the main shaft of the drum being elongated to allow of the 

 attachment of the extra pulley. 



