AQ THREE-FURROW PLOUGH. 



Economical circum fiances, neither the firf: nor fecond plough has any folis 



^'l'^"if""°^'' ^^ land-fidd whatever ; and even the third does not require fo 



-, ' much of either as a fingle plough. I calculate the faving of 



power from the confideration alone, as equal at leaft to one 



' plough. What farther power is faved, I attribute to the light- 



nefs and compaftnefs of the inftrument, 



I am willing to think the fimpiicity of its conflrudllon, and 

 the manner of fixing the plough (confining but of two parts) 

 to the beam, will not efcape your obfervation. When the cutter 

 (for as it is both coulter and lliare, I can give to it no other 

 fingle name) requires to be fliarpened, or new-laid with fteel,' 

 by drawing the two bolts the whole is fet at liberty. 



I make the ploughs to fit each beam indifcriminately ; becaufe 

 when the land is too llrong, or too foul, to work the three, I 

 take off the fecond plough, and transfer the third into its 

 place. 



You will obferve the centre of the whiple-tree fliifts. By 

 this contrivance, the power of the horfes is equalized, though 

 they may be unequal in ftrength, the longer lever being given 

 to the weaker horfe. 



Should the Society wifli for any farther information, it will 

 give me pleafure to furnifh them with it. 

 s I am, Dear Sir, 



Very truly and fincerely, yours, 

 / EDMUND CAT.WRIGHT, 



Wobum, December 14, 1802. 

 Charles Taylor, Efq. 



Reference to the Engraving of the Rev. Edmund Cart- 

 wright's Three-Furrow Plough.' — Plate II. Fig. 1, 2. 



Defcription of P'^8' J • A B, the two wheels of the plough, tfie wheel E 



Mr. Cart- being full one-feventh in diameter larger than the wheel A. 



i\i"fo\v plough*. C DE, the three beams of the plough, of which C is the 



fiiorteft and E the longeft : thefe beams are fixed in jftie ftrong 



crofs piece F, at equal diftances from each other, and braced 



by another crofs piece from C to E. 



G H I, the three cutters which anfwer the porpofe of both 

 coulter and mould-board, each being formed together, or made 

 of one piece of beaten iron. Each cutter is fcrewed to its beam 

 by the fianging-iron K. 



I 



