232 



Report on Trials of Plows. 



dog-rod catches into a staple, k (Fig. 116), on the mould-board; 

 the screw end passes through the hole seen in D, and is secured 

 by the nut. By this arrangement the land side and mould-board 

 are held firmly together as one piece. 



The Breast. 

 A straight line drawn from the point of the share to its junc- 

 tion with the standard measures 22| inches. The ordinates to the 

 breast curve, measured along this line, are, at 4 inches from the 

 standard, i of an inch; at 8 inches, || of an inch; at 12 inches, \f. 

 of an inch; at 16 inches, \^ of an inch; at 20 inches, -^^ of an inch. 



The Mould-Board, 

 Fig. 114, r. Fig. 116, g, rises regularly from the base line and 

 forms a continuous curve with the upper surface of the share; 

 but a vertical flange, s, descends from its front lower edge to the 

 sole. The rear edge of this flange is 19i inches behind the point 



J'Vr/. i/'O. 



