28 JETHRO WOOD; 



" Moreover, if a right line be drawn from 

 a point on the just described perpendicu- 

 lar, an inch, or thereabouts, above the upper 

 margin of the fourth side, and from the 

 point to which the said perpendicular, if 

 continued, would reach ; if, the said Jelhro 

 Wood repeats, a right line be drawn down- 

 ward and forward, not exactly parallel to the 

 diagonal herein already described, but so di- 

 verging from the same that it is one inch more 

 distant or further apart, at its termination on 

 the fifth side of the mould-board, than at its 

 origin or place of beginning ; such line, so 

 beginning, continued, and ended, is a right 

 line parallel to the mould-board along its whole 

 course and direction, and the space over which 

 it passes has no inequality, hill, or hollow 

 thereabout. 



" Furthermore, an additional property of his 

 mould-board is, that, if it be measured and 

 proved various ways, vertically and obliquely, 



