Chap. XIX. The Four-coulter d Plough. 29 jT 



durable. Its Depth and Breadth may vary, accord- 

 ing to the heavier or lighter Soil it is to till •, but this 

 before us is in Depth Five Inches at the firft Coulter- 

 hole, and in Breadth Four Inches. 



Fig. 4. Is the Sheat Qjn Fig. 1. (broad Seven 

 Inches) with the Iron Retch on it, the left Leg of 

 which Retch mud ftand foremoft, to the end that 

 the Edge of its Fore-part, that is flat, may fit clofe 

 to the Wood of the Sheat: This Retch holds the 

 Sheat faft up to the Beam by its Nuts and Screws ; 

 as alfo doth a Pin driven into the Hole a, which 

 Plole being a fmall Part of it within the Beam, the 

 Pin being driven into the Hole, draws up the Sheat 

 very tight to the Beam. The principal thing to be 

 taken notice of here, is the Angle b c d 9 which fhews 

 the Elevation of the Sheat ; the Line c dis fuppofed 

 to be equal with the Bottom of the Share (or rather 

 with the plain Surface whereon it ftands) ; when this 

 Angle at c is larger than of Forty-five Degrees, a 

 common Plough never goes well : In my Four-coulter 

 Plough I choofe to have it of Forty-two or Forty- 

 three at the moil. 



Fig. 5. Is the Share ; a is the End of the Point ; 

 b is the Tail of the Share, long from a to b Three 

 Feet Nine Inches; c the Fin ^ d the Socket, into 

 which the Bottom of the Sheat enters ; e a thin Plate 

 of Iron riveted to the Tail of the Share : By this 

 Plate, the Tail of the Share is held to the hinder 

 Sheat, as at d in Fig. 1. by a fmall Iron Pin with 

 a Screw at its End, and a Nut fcrew'd on it on the 

 inner or right Side of that Sheat. From a to f is the 

 Point, long about Three Inches and an half, flat un- 

 derneath, and round at Top : It mould be of hard 

 Steel underneath. From / to c is the Edge of the 

 Fin, which mould be well fteeled; the Length of it 

 is uncertain, but it fhould never make a lefs Angle at 

 / than it appears to make in this Fig. The Socket 

 is a Mortife of 'about a Foot long, at the upper Part, 



U4 Two 



