Chap. IL OF DRILL-PLOUGHS. 435 



** TKn/embrador, or box, is, according to Don Lucatello's method, 

 to be tied faft to the hind part of the plough, fo that the corn may 

 fall in the furrow, and at the turning of the plough, its ears may 

 cover the corn of the lafl: furrow with earth. Care mufl be taken 

 that the wheels on the fides of this inftrument do always turn round, 

 and never drag along without turning : to which end, it muft be 

 faftened to the plough-beam, at fuch a height that the nails in the 

 wheels may ftand on the ground, to make them turn round. The 

 ears of the plough ufed on this occafion muft: alfo be made larger 

 than ordinary, that they may cover the furrows better, when fown, 

 and make wider furrows to receive the feed." 



Both thefe inft:ruments have their imperfedlions. The manner 

 in which the wheels, and confequently the cylinder of tht fcmbrn- 

 dor are turned, muft: occafion an unequal diftribution of the feed, 

 wherever the ground is rough or ftoney: and in Mr. Worlidge's 

 drill, the feed is liable to be bruifed as it drops from the hopper, 

 by the wheel in the neck of that hopper. 



We apprehend that a more ufeful inftrument may be formed out 

 of thefe two, than either of them is as they now ft:and : •viz. by 

 fixing the box of the fembrador, in the frame of Mr. Worlidge's 

 drill. A fquare frame, like that, will keep the box more fteady, 

 and therefore render the difcharge of the feed more regular, than it 

 can be either in Don Lucatello's manner, or in a fingle frame, 

 as propofed by M. Diancourt, in an inftrument formed on thefe 

 principles, and of which M. Duhamel gives the following de- 

 fcription. 



On the outfide of the fliafts a a, b b, [Plate IV. Jig. 5.) are two 

 wheels. Their axle-treee ddd turns round with them. 



On this axle-tree are two pullies ee, which receive into their 

 grove two \ints ff, which turn the cylinder G g. Jig. 6 and 7., 

 This cylinder has three rows of fpoons fixed on it, and goes through 

 the hollows zzzz (Jig. 8.) of the half barrel H h. Jig. 7 and 8. 

 This half barrel is placed Hoping in the box /, /, Jig. 7 and 5, as is 

 reprefented at the bottom of that box, at h. Jig. 7. 



The box / is reprefented with its cover on in Jig. 5. In Jig. 7. 

 one of the ends is taken off, to fhew at h the end of the half 

 barrel g ; one of the ends of the cylinder K, and feme of the fpoons /,. 

 Jig. 6 ; with an inclined plane L, which forms a hopper, into which 

 the feed is put, and from whence it drops to the bottom of the barrel 

 /jj Jig. 7. through the pipes MMM, Jig. 9 ; and ?nmm, Jig. 7. 



K k k 2 Thefe 



