4 i2 A P P E N D I X. 



and inftead of a tender Steel Spring, there is a ftrong 

 Piece of Iron without Elafticity. By means of this 

 Iron, the Machine grinds the Seed, inftead of drill- 

 ing it. 



What I (hall here add concerning the Wheat-drill, is 

 fome Alterations in Fig. 21. of Plate 4. viz. The fore 

 Share and Sheat muft be left out for drilling Wheat, 

 no more middle Rows being ufed. And the Two 

 Beams B B in the Plough, Fig. 1. muft be fet to make 

 Chanels Ten Inches afunder. And the double Hopper, 

 Fig. 15. muft be fet nearer together, fo as the Seed 

 may fall into the middle of the Funnels of the Beams. 

 Tho' there is no NecefHty of Marking-wheels for 

 guiding the Drill-horfe upon Ridges •, yet they are 

 very ufeful for holding the Drill fteady, and to pre- 

 vent its tottering, which without the Marking-wheels, 

 and the fore Hopper, it is apt to do, when the Shares 

 ftand fo near together as Ten Inches j and on a nar- 

 row Ridge one of the hinder Wheels might run off to 

 the Furrow, and draw the Shares after it, if the Drill 

 were not kept fteady by the Marking -wheels, and by 

 their Hopper, which takes hold of the flngle Stan- 

 dard by Fig. 22. as is feen in Fig. 21. in Plate 4. 

 But there fhould not be fo much room in it on each 

 Side of the Standard, left the Plough by that means 

 mould have too much room to totter, now the 

 Shares are fo near together. 



The Marking-wheels muft be fet at the Diftance 

 of the Breadth of Two Ridges, which, as we now 

 make them, is about Nine Feet and an half from 

 Wheel to Wheel. 



The Brafs Box may be taken out of the fore Hop- 

 per : And tho* that Hopper be of no Ufe to the dou- 

 ble Row, except as is abovefaid -, yet if there fhould 

 be Occafion to prefs the Marking-wheels deeper into 

 the Ground for keeping the Plough the more fteady 

 in its Courfe, it may be ufeful ly filled with Earth, or 

 other Matter, fufikient for that Purpofe. And b«- 



ildes, 



