[Fig. 4.] shews one Side of the Share. The prick’d Line a e shews the Bevel of the Fore-end of the Socket, the upper Edge of which must bear upon the Fore-part of the Sheat below f in [Fig. 2.] and the other Part of the Share will bear against the Bottom of the Sheat, from d to c, and will be fastened up by a flat Nail, passing thro’ the foremost Hole of the Share, and entering the Hole g in the Sheat; which Nail being bended in the said Hole (which Hole should be at least an Inch Diameter) will hold the Share fast to the Sheat; and, by unbending this Nail, the Share may be easily taken off, upon Occasion, without damaging the Sheat. Note, This Hole in the Share ought to be wider below than above, and the Head of the Nail of the same Shape; or else, as the Share wears thinner, it might come off. The prick’d Line, near the Fore-part of the Sheat, shews where a Shoulder must be cut on each Side of it, because otherwise the Sheat, being thicker than the Breadth of the Socket of the Share, could not enter it: But take care, that the Share do not bear against these Shoulders.
[Fig. 5.] is one Side of the Trunk, being a thin Plate of Iron, and is often made of the Blade of an old Scythe: It is to be riveted on to one Side of the Sheat, to another of the same on the opposite Side, by Three Rivets passing thro’ them both, with the Sheat in the Middle of them; which Holes appear both in the Plate and in the Sheat. These thus riveted on do form the Trunk at the Back of the Sheat. The whole Breadth of this Plate is an Inch and Three quarters; but Three-eighths of an Inch being riveted on to the Sheat, there remains but an Inch and Three-eighths for the Trunk. The Length of the Plate is the same with the Depth of the Sheat and Share, except that it should not reach to the Bottom of the Share, by about the Thickness of a Barley-corn, to the end that it may not bear against the Ground, as the Share doth. The Notch at the Bottom of the Plate is that which answers the Notch in the Tail of the Share: The Corner of the Plate at a we make a little roundish, that it may not wear against the Ground.
This Plate thus riveted on the Sheat, and another of the same Form on the other Side opposite to it, compose the Trunk, which is [Fig. 6.] a d is the Edge a b of the Plate [Fig. 5.] b c is the like Edge of the opposite Side of the Trunk. A is the Back of the Sheat, which, together with the Tail of the Share when in its Place, makes the Fore-part or Length of the Trunk. The Thickness of this Back of the Sheat is the Width of the Trunk; and from this Back of the Sheat to the said Edges of the Plates, may be call’d the Depth of the Trunk. The upper Ends of these Two Plates a and b we spread open a quarter of an Inch wider, for half an Inch down, than the rest of the Trunk, for the more free Reception of the Seed from the Hole of the Funnel: We likewise take care, that the Two lower hinder Concerns of the Trunk do not incline to one another, to make the Trunk narrower than the Back of the Sheat, lest the Earth should be held in by them, and fill the Bottom of the Trunk.
[Fig. 7.] is one of the hinder Sheats, and appears, in part, at c in [Fig. 1.] It is fastened into one of the Beams by its Tenon, which, being driven into a Mortise, is pinn’d in by a Pin passing thro’ the Beam, and the Tenon cut off even with the upper Surface of the Beam: This Tenon stands more oblique than that of the fore Sheat, that there may be the more Wood between its Mortise and the Funnel, its hinder Shoulder being short: Its fore Shoulder at a must be very short, not above the Eighth of an Inch; but its Shoulder b Three quarters of an Inch. The Tenon is also shoulder’d on each Side, as well as before and behind. The Thickness of this Sheat should be greater than that of the Fore-sheat, because it is much narrower. The Depth of this Sheat, is less than the Fore-sheat, by the Depth of the Beam: It is, in all other respects, the same with the Fore-sheat, except that it and its Share are shorter. The Socket of this Share is but an Inch and One-eighth long, its Breadth half an Inch, and from the Fore-part of the Bottom of the Socket to the End of its Tail, but three Inches. Its Point from the Socket at Bottom is but Three quarters of an Inch, whereas the Point of the Fore-share is an Inch and Three quarters: There is but one Hole whereby the Share is fastened up to the Sheat. Its Trunk is no wider than the other; for we cut a Rabbet on each Side of the Sheat, that the Plates, which are the Sides of the Trunk, may come within Three quarters of an Inch of one another. Its Tenon, being narrower than the Tenon of the Fore-sheat, must be thicker than it.
The other Hinder-sheat, and all its Accoutrements, must be the same as this of [Fig. 7.]
The Workman must take care, that the Tenons of the Sheats be not made cross the Grain of the Wood; and therefore must make them of crooked Timber.