npo O/Ploughs. Chap. XVIIL 



Spit deep, is one extraordinary Benefit of it, tho J it 

 may, on Occafion, go as fhallow as any. 



The Draught is not fo much inereafed by adding 

 Three Coulters, as may be imagined ; for when the 

 Ground is moift, the Incifions are eafily made by the 

 Edges ; and when they are cut fmall, the Furrows 

 rife much more eafily upon the Share and Earth- 

 Board, than if whole. 



Farm. If this Plough be fo beneficial, having fo 

 many Advantages, and only the Two Inconveniencies, 

 one of requiring a little more Strength to draw it, and 

 the other its being unfit for dry- hard Ground, I wonder 

 why it is not become more common ? 



Refp. It has been ufed with very great Succefs for 

 thefe feveral Years laft pad, but never like to be 

 common, unlefs it be defcribed in a more geometrical 

 Manner, than any Plough has hitherto been \ for the 

 Plough-wrights find it difficult enough to make a 

 common Plough with one Coulter to perform as it 

 ought, for want of the neceffary Rules of their Art. 

 It is upon this Account that the Two-couker'dPloughs 

 are ufed in few Places, though they have been found 

 of excellent Ufe, and have been formerly common: 

 But, alas! when the Makers, who by their diligent 

 Study and much Practice had attained the Perfection 

 of their Art, died for want of learning to write their 

 Rules mathematically, and mew how the mechanical 

 Powers were applicable to them, the Art was in a 

 Manner loft, at the Death of thofe Artifts ; and then 

 the unfkilful Plough-wrights, deftitute of the true 

 Rules, were not able to make a Two-coulter'd Plough 

 to perform well, and then it was left off. Very 

 lately 'tis revived, fince the Three and Four-coulter'd 

 ones have been ufed ; from whence fome have made 

 a Shift to take the Rules of placing Two Coulters 

 into a Plough, and they begin to be common again ; 

 and, no doubt, will ceafe again as foon as the Rules 

 are forgot. 



'Tis 



