26o 



Annals of Horticulture. 



being large enough to move freely upon the post. For the 

 vertical adjustment of the mold-boards, a link connects the 



staple on the 

 forward end of 

 each with the 

 forward end of 

 a lever, f u 1 - 

 crumed upon 

 an upright of 

 the frame," a 

 rack secured to 

 one of the side 

 beams being 

 provided for 

 each lever. 

 Fig. 22. which extends 



to within easy 

 reach of the 

 driver. A stir- 

 rup is bolted up- 

 on the outer face 

 of each mold- 

 board at its rear 

 end, a chain 

 from each stir- 

 rup passing over 

 a friction pulley, 

 journaled at the 

 upper end of a 

 rack secured to^^ 

 the center cross "-^ 

 beam, to attach- 

 m e n t with a 

 lever pivoted on 

 the forward 

 cross beam, and 

 extending to the 

 driver. The mold-boards are so hung that they are quite a 

 distance apart at their forward ends, and nearer together at 

 the rear, where the two boards are connected by a spiral 

 spring, which spring is attached through short, adjustable 



,'<^/-; 



FiG. 23. 



