INVENTOR OF THE MODERN PLOW. 31 



descending. By means of these screw bolts, 

 wedges, latches, and keys, with their appro- 

 priate notches, teeth, and joggles, the Plough 

 may be deepened or shallowed most exactly. 



" In the third place, the said Jethro Wood 

 claims an exclusive privilege in the inventions 

 and improvements made by him in the con- 

 struction of the cutting edge of the mould-board, 

 or what may be called, in plain language, the 

 plough-share. The cutting edge consists 

 of cast iron, as do the mould-board and 

 land-side themselves. It is about twelve 

 inches and one half of one inch long, 

 four inches and one half of one inch broad, 

 and in the thickest part three quarters of an 

 inch thick. It is so fashioned and cast, that 

 it fits snugly and nicely into a corresponding 

 excavation or depression at the low and fore 

 edge of the mould- board, along the side here- 

 inbefore termed the first side. When properly 

 adapted, the cutting edge seems, by its uni- 



