Supposing the Path of the Horse to be a strait Line, and the pricked Line _h i_ (which is at right Angles with the Plank, and equidistant from each Limber) to go exactly over it, without making any Angle on either Side of it; then the Beam must be placed at right Angles with the Plank, to the End that the Share may go parallel to the Horse-path, excepting that very small Inclination that its Point has to the left, shewn by the pricked Lines in _Fig._ 1. of _Plate_ 1. But this Plough seldom follows the Horse in that manner. The said pricked Line _h i_ generally makes Angles with the Horse-path; else when the Beam stood near the left Limber, and the Draw-pin near the right Limber in the Hole 9. (which it must do to keep the Share parallel to the Horse-path) the Weight of the right End of the Plank and its Limber would be too heavy for the right Hand of the Holder to manage; and if the Draw-pin be removed (suppose) to Hole 7. the Parallelism of the Share with the Horse-path will be lost, and the Point of the Share may be inclined too much towards the Left; and when a Furrow is to be plowed on the right Side of the Horse-path, the Beam must be removed nearer to the Middle of the Plank, and the Draw-pin must be placed on the left Side of the Beam, suppose to the Hole 2. This will bring the greatest Part of the Plank to the right Side of the Horse-path; and then the Share, standing at right Angles with the Plank, will make a very large Angle with the Horse-path, and then the Plough will not perform at all. Therefore it being necessary, that the Share always go parallel to the Horse-path, and often as necessary that the Plank go at oblique Angles to the Horse-path; it follows then that the Beam stand at oblique Angles with the Plank, to preserve the Parallelism to the Horse-path; and this cannot be done but by the Holes which are shewn under the pricked Lines which cross the Plank. The Holes A, B, C, are those to one of which the Beam is screwed up by its Hole G, in _Fig._ 2. These Holes are made as near to the hinder Edge of the Plank, as they can safely be, without Danger of tearing out; which is generally about an Inch distant from the said Edge. Every one of these Holes are answered by Three others, near the fore Edge of the Plank, as the Hole B has, at the fore Edge of the Plank, the Holes D, E, F, D, E belong to the Hole I of the Beam _Fig._ 2. These Two Holes are made as near together as they can be without breaking into one another. F answers the Hole H in _Fig._ 2. and is made between D and E, as near them as safely it can.