[ 4^0 3 



for the purpofe three horfes, as its weight is very 

 confiderable, and will require fo many. It has 

 been hitherto cniefly ufed on clover or other grafs 

 lays on the firft ploughing, but may be as properly 

 employed on land which has been three or four 

 times ploughed. The view of the model will, I 

 believe, give a full and clear idea of its operation, 

 ^nd make it unnecefTary to add further to this ac- 

 count of it. Should the Gentlemen of the Society 

 think otherwife, and that the objedt is worthy their 

 attention, I fhall readily convey to them every ex- 

 planation they Ihall require. 



I am. Sir, on this and every occafion, with much 

 regard and eileem, 



Your's, &c. 



Hethely THOMAS BEEVOR. 



Dec. 22, 1788. 



fin* The model above alluded to is delineated on a fmall 

 fcale, as per plate No. 2. The conftrudion of it is fo ob- 

 vious, that bare infpe£lion may fuffice to fhew its ufe. It 

 is contrived for three horfes to draw abreaft, driven by a man 

 elevated behind them. The length of the roller may be more 

 or lefs, according to the choice of the owner : and the ribs of 

 it may be alfo deep or (hallow, fo as to determine tliC depth 

 of the drills, and thedifiances of the rows, by the fame rule. 



The 



