Chap. XXI. Of the Wheat-Drill. 3 53 



ing thus wider below than above* and having all its 

 Sides true Planes and fmooth, it is impofiible for the 

 Seed to arch therein. The fore Side of this Hole is 

 perpendicular to the upper and lower Surfaces of the 

 Plank, and, together with the Back of the Sheatj 

 makes one Plane Surface. 



When we drill a large Species of Seed, as Peas or 

 Oats, we can make this Hole a full Inch fquare at 

 Top, and of the fame Shape wider at Bottom •, which 

 tho' it be wider than the Trunk, except at its Top* 

 the Seed will not arch there, becauie there is room 

 behind, the Plates being broader than the Sides of the 

 Hole ; for there can be no Arching in the Trunk, 

 unlefs the Seed were confrVd behind as well as on each 

 Side. 



The Holes of our Funnels ous;ht to be of the fame 

 Shape with this defcribed; tho*, as I am inform'd, 

 the Pretenders to the making of this Plough make 

 the Holes of their Funnels the Reverfe of this; which 

 being wrong-way upwards, the Seed is apt to arch in 

 them, except the Holes are very large. 



Of this Plough, Fig. 1. the Two hinder Funnels 

 E and F differ from the fore Funnel (which has been 

 defcribed), firft, in Dimenfions ; thefe not being fo 

 deep, becaufe they being made in the very Beams, 

 their upper Edges are in the upper Surface of the 

 Beams, and their Holes at the Bottom, being about 

 the Eighth of an Inch deep. The Depth of the 

 Funnels mud want the Eighth of an Inch of the 

 Thicknefs of the Beams ; but we make each Funnel 

 an Inch and a quarter broader at Top than its Beam, 

 by adding a Piece of Wood to each Side of its 

 Beam, which reaches down about half-way its Thick- 

 nefs ; and thefe Pieces being firmly fix'd on by Nails, 

 to the Sides of each Beam, the Legs of the Harrow 

 take hold of thefe Pieces, which are in the Infide 

 of thefe Beams. When the Plough is taken up to be 

 turn'd, the Man who turns it takes held of the 



A a Heatf 



