THE CONICAL PLOUGH. 



335 



reaches a point higher up on the mouldboard, where a moro 

 abrupt curve hastens it over. 



APPLICATION OF THE CONE. 



By this form of the mouldboard, the furrows are more 

 thoroughly pulverized and crumbled up, than when tlie board 

 is made to fit the straight surface of a cylinder. Tiie surface 

 of the board of the conical plough is neither concave nor con- 

 vex in a horizontal plane, so that the friction between the board 

 and the furrow slice is uniform, no greater in one place than 

 another. It cleans, therefore, more readily than a concave board 

 can do, and the wear is evenly distributed over the surface. 

 The draught of this plough is easy, and in light and medium 

 soils it leaves the surface even and mellow. Being short on 

 the sole it is well adapted to stony land. It is remarkably 

 evenly balanced, and in stubble land it scarcely requires holding. 

 This shows the plough to be made on true mechanical principles. 



MEAD'S CONICAL PLOUOB. 



