294 The Four-coulter d Plough. Chap. XIX. 



there is betwixt the common Plough, and the Four- 

 coulter Plough, beginning with Fig. 2. where it is 

 reprefented as (landing upon a level Surface. 



Fig. 2. And, Firft, The Beam differs in Length, 

 being Ten Feet Four Inches long, as the other Plough- 

 beam is but Eight Feet ; it differs in Shape, as the 

 other is (trait from one End to the other, but this is 

 flrait only from a to £, and thence turns up of a fud- 

 den, in the manner that is (hewn in the Cut; fo that 

 a Line let down perpendicular, from the Corner at <z, 

 to the even Surface whereon the Plough Rands, would 

 be Eleven Inches and an half, which is its Height in 

 that Place; and, if another Line were let down, from 

 the turning of the Beam at Z>, to the fame Surface, 

 it would be One Foot Eight Inches and an half*,, 

 which is the Height that the Beam (lands from the 

 Ground, at that Part ; and a Third Line let down to 

 the Surface, from the Bottom of the Beam, at that 

 Part which bears upon the Pillow, will (hew the Beam 

 to be Two Feet Ten Inches high above the Surface 

 in that Part. 



From the End a, to the Back-part of the firft 

 Coulter, is Three Feet Two Inches; from thence, to 

 the Back of the next Coulter, is Thirteen Inches ; 

 thence to the Third, Thirteen Inches; and from thence 

 to the Fourth, the fame. From a to b is Seven 

 Feet. 



This Crookednefs of the Beam is to avoid the too 

 great Length of the foremoft Coulters, which would 

 be neceflary if the Beam was flrait ; and then, un- 

 lefs they were vaftly thick and heavy, they would be 

 apt to bend, and the Point of "the Fourth would be 

 at fo great a Diflance from its Coulter-hole, that it 

 would have the greater Power to loofen the Wedges, 

 whereby the Coulter would rife up out of its Work, 

 as it never doth when the Beam is made in this bend- 

 ing Manner. This Beam is made either of Afh, 

 which is the lighted, or of Oak, which is the molt 



durable! 



