Chap. XXI. Of (he Wheat-Drill 3 ; 1 



yet more than Six Feet afunder, the Wheels going on 

 the Sides of the next Ridges would be apt to turn 

 the Drill out of the Horfe-path towards one Side, 

 not permitting the Drill to follow directly after the 

 Horfe ; and if the Wheels mould ftand at Six or 

 Seven Feet Diftance from one another, then they 

 mud go in the Furrows which are on each Side of the 

 Six-feet Ridge: This would occafion their Hopper 

 to bear upon the Plank, which would carry theWheels 

 above the Ground, and no Seed would be turned out 

 of the Hopper, unlefs the Wheels were of an extra- 

 ordinary Height (a)-, and the Height requir'd for 

 them would be very uncertain, fome Furrows being 

 much deeper than others ; but the Tops of con- 

 tiguous Ridges are generally of an equal Height, 

 whether the Furrows betwixt them be deep or mallow ; 

 for we feldom make Ridges of an unequal Height 

 in the fame Field : Therefore there can be no need to 

 change the Height of our Wheels, that are to go 

 upon the Middle of the Ridges; but if they went in 

 the Furrows they muft be of a different Height 



fa) Notwithstanding the Reafons given, and that I have never 

 ufed Wheels of fuch an Height as might be neceffary for going 

 in the Furrows, yet it may not be amiis to try fuch; becaufewith 

 them the Spindle needeth not to be more than half the Length of 

 one that is carried by low Wheels : And high Wheels will allow 

 the Funnel to be much larger, fo that altho' the Spindle go higher 

 from it, no Seed will drop befide a large Funnel; but there is 

 not room for a large one under low Wheels. 



J did not think it neceffary to defcribe the Manner of making 

 Drill-wheels any otherways than by fhewing them in the P latest 

 but I will obferve here, that they are to be made very light : One 

 of mine, that is 30 Inches high, weighs Five Pounds and an half; 

 it has a Circle or Ring of Iron, whofe Depth is half an Inch, and 

 its Thicknefs a quarter of an Inch ; alfo very thin Iron Stock- 

 bands to hold the Nave or Stock from fplitting. The Circle is 

 held on the Spokes by fmall flat Iron Pins on each Side ; and each 

 Spoke has a Ring of Iron to fecure its End from being fpiit by 

 driving in of the Pins. V/e alfo make the Drill-wheels lefs 

 concave than other Wheels are. 



B b 2 when 



