THREE-FURROW PLOUGH. ^ 



I will thank you to communicate this letter, and the certifi- 

 cate accompanying it, to the Committee of Agriculture; and 

 and if they are difpofed to think favourably of this invention, 

 I will fend you a model for their infpedion. 

 I am. Dear Sir, 



Your very obedient fervant, 



EDMUND CARTWRIGHT. 

 Woburn, OSt, 20, 1802. 



This is to certify, that the three-furrow plough invented by Certifieatci 

 the Rev. Edmund Cartwright, ploughs a furface of twenty- 

 feven inches each bout, and that on light land a pair of horfes 

 regularly ploughs three acres per day with it in a workmanlike 

 Planner. 



JOHN DUCKITT, as Bailiff to 



his Grace the Duke of Bedford. 

 WILLIAM BAXTER, Affiftant. 

 Jime2\Ji, 1802, 



Dear Sir, 



YOU herewith receive the model of my three-furrow why this plough 

 plough. if^^^" power. 



The faving of hands, and confequently of expence, in a 

 pjlough of this kind, is obvious; but why there fliould be a 

 faving of power, may require to be explained. 



I need not obferve to you, nor to any man who confiders the 

 aftion of a common plough, that a very material part of the 

 labour in ploughing, arifes from the fri£tion o\' the land fide and 

 thefole; of the cneagainft the fide of the furrow, of the other 

 againfl: thje bottom. In a fingle plough a certain length and 

 width are required in thofe parts of it^ to make it go fteady ; 

 and even then the effed would be iraperfeftly obtained, did not 

 the ploughman affift by the leverage of the handles of the 

 plough. Hence it is clear, that the lefs difpofition any plough 

 has to follow the draught in a ftrait line, the greater is the labour 

 of working it, becaufe the ploughman in that cafe is to exert a 

 greater power of leverage to keep it fteady. On the contrary, 

 when two, three, or more ploughs are combined, they ferve 

 to fteady each other, and require comparatively very little 

 power of the lever to keep them in a ftrait line. Under thefe 



circumflances. 



