2p6 The Four-coulter d Plough. Chap. XIX. 



Two Inches deep : The Fore-end of this Mortife 

 mult not be perpendicular, but oblique, conformable 

 to the Fore-part of the Sheat which enters it ; the 

 upper Edge of which Fore-part muit always bear 

 againit the Sheat at e in Fig. 4. but if this End of the 

 Socket fhould not be quite fo oblique as the Sheat, it 

 may be help'd, by taking off a little of the Wood at' 

 the Point c. 



Fig. 6. Shews the Share, with its right Side up- 

 wards, in the fame Poflure as when it piows ; whofe 

 Side a b fhould be perfectly (trait, but its under 

 Side at r, which is its Neck, fhould be a little hol- 

 low from the Ground, but never more than half an 

 Inch in any Plough, and a Quarter of an Inch in a 

 Four-coulter Plough -, fo that the Share, when it is 

 firlt made, ftanding upon its Bottom, bears upon the 

 level Surface only in Three Places -, viz. at the very 

 Point a 9 at the Tail £, and at the Corner of the 

 Fin d. 



Fig. 7. Is the Share, turn'd Bottom upwards; and 

 fhews the Concavity of the Fin at a\ which mult be 

 greateft in a ftony rubbly Soil. 



Fig. 8. Shews the Share, the right Side upwards, 

 but leaning towards the Left. 



In placing of the Share rightly upon the Sheat, 

 confifts the well going of a Plough, and is the moft 

 difficult Part of a Plough- wright's Trade, and is very 

 difficult to be (hewn. Suppofing the Axis of the 

 ftrait Beam, and the left Side of the Share, to be 

 both horizontal, they muft never be parallel to each 

 other \ for if they were, the Tail of the Share, bear- 

 ing againit the Side of the Trench, as much as the 

 Point, would, caufe the Point to incline to the right 

 Hand, and go out of the Ground into the Furrow. 

 If the Point of the Share fhould be fet, fo that its 

 Side mould make an Angle on the right Side of the 

 Axis of the Beam, this Inconvenience would be much 

 greater ; and if its Point fnould incline much to the 



5 Leftg 



