Mechanical Conditions of the Plow. 



193 



all positions, and to grow a much larger crop upon an acre than 

 they have ever done before. 



Before entering upon a consideration of the parts of a plow in 

 detail, it is desirable to define those parts with accuracy, so that 

 all ambiguity and misapprehension may be avoided 

 I 



Fig. i02. 



Fig. 102 represents Mr. Holbrook's Sod and Subsoil Plow. 

 A B is the beam; g i the skim plow; s t its standard; li i its fin 

 coulter; j the wheel; h the bridle; a the point of the plow; ach 

 the share; h a' the feather; h the rear angle of the feather; «' the 

 front angle of the feather; e u c v the mould-board; f v the sole 

 of the mould-board. The portion of the mould-board in contact 

 with the furrow slice, at the instant that it assumes the vertical 

 ]30sition, is called the zero line, and is marked on the figure. The 

 portion of the mould-board in the rear of this zero line is called 

 the wing of the mould-board; d uis, the standard; u c a the line 

 where the portion of the mould-board in front of the standard, 

 which coincides with the land side, is called the shin. The curved 

 portion of the plow, included in il v «, is the breast. The furrow 

 side of the share is denominated the shield. The side of the 

 figure towards the eye is the furrow side, and the opposite one is 

 called the land side; m and Z are the stilts or handles; oj^and 

 q r are the handle braces. 



ON THE VARIOUS MEANS OF HOOKING TEAMS TO THE PLOW. 



This is done by swing or swingle trees and bars, as they are 

 called by some, or whiffle trees and eveners, as they are called by 

 others. The length of the evener is generally three and a half 

 feet; the length of the whiffle tree, between the hooks of the 

 traces, is three feet, but these lengths are often considerably 

 laised in order to meet special conditions. 



13 



