History of the Plow. 



43 



land side plute is eii2:htceii inches in length on the lower edge, 

 beino- one and one-half inches longer than the corresponding edge 

 of the sole plate, the purpose of which will be seen in the figure 

 of the land side, Fig. 46 ; the length of the upper edge is twenty- 



one and one-half inches. The breadth and the contour of the 

 upper edge must be adapted to the form that may have been 

 given to the beam. The thickness at the lower edge must agree 

 with that of the sole plate, and be diminished to one-half of an 

 inch at the upper edge ; weight, nine pounds. 



The coulter, Fig. 42, is an edge, and Fig. 43 a side view of the 

 coulter of this plow, in which the same letters of reference are 



a' 'b c J 



aigpiiiiiiiijiiiii iiiiiiiiiiiiiiiiii iiiiiiiiiiiii^iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii^ 



l^iff. 4-3. 



applied. The neck a b, by which it is affixed in the coulter box, 

 is about ten inches long, though it may, with all propriety, be 

 extended to c / the neck is usually about two inches in breadth, and 

 three-quarters of an inch in thickness. The blade bed varies in 

 length, according to the variety of the plow to which it ])e]()ngs, 

 from eighteen to twenty-two inches. The breadth of tlie ])lade is 

 usually about three inches in the upper part, but is curved off 

 behind, and terminating in a point at d. The thickness of the 

 back at the shoulder b is three-quarters of an inch, and tapers 

 gently downiward to where the curvature of the back begins ; 

 thence it diminishes toward the point to one-eighth of an inch or 

 less. It is formed quite fiat on the laud side, and on the furrow 



