THE PLOW FOR COVERING RUBBISH 



477 



it has been raised and put in a stretched condition, when 

 the roots are most easily severed. This position is a 

 little back of the point of the share. A knife edge 

 attached to the share is commonly called a fin coulter. 

 A jointer is a miniature moldboard attached to the 

 beam for cutting and turning under the upper edge of 

 the furrow slice, so that a neat, clean turn is effected 

 without the exposure of a ragged edge of grass which 

 may continue growth. This is used chiefly on sod land. 

 A drag-chain is an ordinary heavy log-chain, one end 

 of which is attached usually to the central part of the 

 beam, and the other to the end of the double tree on 

 the furrow side, and with enough slack so that it drags 

 down the vegetation on the furrow slice just ahead of 

 its turning point. It is used, primarily, in turning under 

 heavy growths of weeds or green-manure crops. 



There is a third type of plow, the so-called subsoil 



Fig. 136. The orchard disc. Adjustable and suited to working close up to 



low-headed trees. 



