The Harrow is pinned on to the Beam by the Iron Pin, _Fig._ 9. passing thro’ the Hole of the Leg at _g_, and thro’ the Beam, and also thro’ the other Leg on the other Side of the Beam, where the Screw at the End of the Pin has a Nut screw’d on it. This Pin is round from its Head all the Way thro’ the first Harrow-leg, and thro’ the Beam; but all that Part of the Pin, which is in that Leg against which the Nut is screw’d, must be square; whereby that Part being bigger than the round Part of the Pin, and than the Hole in the last-mention’d Leg, cannot turn in the Hole of that Leg; for if it did, the Nut would be soon unscrew’d by the Motion of the Harrow; but the Pin must have room to turn in the other Leg, and in the Beam. This square Part of the Pin is seen at _a_, _Fig._ 9. The whole Length of the Pin, from its Head to the End of the square Part at _a_, where the Screw begins, is of the Thickness of the Two Legs, and of the Breadth of the Beam. We sometimes set the Legs of the Harrow Two Inches wider asunder, by making them each an Inch thicker at their fore Ends in their Inside, and reaching Five or Six Inches behind their Iron Pin: These thicker Parts, bearing against the Beam, keep the hinder Part of each Harrow-leg an Inch distant from the Sides of the Beam, whereby the Harrow-legs are Six Inches asunder, instead of Four, by means of these added Thicknesses. When a Drill is taken up to be turn’d, the Person that does it, takes hold of the Harrow-head, and lifts it up: The Legs of the Harrow, bearing against the cross Piece, support the whole Weight of the Drill. When the Harrow does not go deep enough, we tie a Stone upon the Middle of the Harrow-head, by a String that passes thro’ the Holes at _h_. All the Wood of this Plough and Harrow is Ash, except the Limbers. The Hopper of the Turnep-drill is very different from those already described. It consists of a Box placed into the Middle of a Carriage; which Box is described in all its Parts, lying open with their Insides upwards in _Fig._ 10. A is the fore Side of the Box, Five Inches and an half deep, and Six Inches and an half long. B, the hinder Side of the Box, opposite to the former, and of equal Dimensions. Each End of the Box is made with Three Pieces of Board, of which C the uppermost is Three Inches and a quarter deep, and Five Inches long; which Length is the Breadth of the Inside of the Box. The End of the Piece C, when in its Place, stands against the prick’d Line _a b_ in the fore Side A; the other End standing against the prick’d Lines in B, which is opposite to, and corresponds with, the prick’d Line _a b_; the fore Side, and hinder Side, being screw’d to the Ends of this Piece by Four Screws. The Piece D is Two Inches and a quarter broad, and of the same Length with the Piece C, and screw’d up to the Bottom of it with Two Screws, and then its End will bear against the prick’d Line _b c_, and that which is opposite to it in the Side B.