But, instead of turning the Plank, it would be better to have a Fourth Hole in the Beam, standing as near to the hinder Hole as H doth to the fore Hole; to answer which Fourth Hole, there may be Two Holes in the Plank, one at each Side of the hinder Hole of every System at proper Distances, to set the Plough still at more different Angles with the Plank; and these, I believe, will be more convenient for the Purpose than the different Holes in the fore Part of the Plank, it being easier to remove the hinder Screw than the fore Screw; because if the Plank and Limbers are not held up by somebody, whilst the fore Pin is out, their Weight will wrench out the hinder Hole of the Plank by that Screw; but whilst the hinder Screw is out, there is no need of holding up the Plank, because its Weight, bearing upon the Beam, cannot injure the foremost Hole, whilst the Limbers bear upon the Horse. Upon this account, I wonder we had not made the Holes, for changing the Position of the Beam, at the hinder Part of the Plank rather than the fore Part; which convinces me, that new Instruments are seldom perfect in the Beginning. We can also alter the Standing of the Beam, by cutting away the Wood on one Side of an Hole, and placing a Wedge on the opposite Side of the Pin. The Holder may make some Alteration in the Going of the Plough by the Handles. The Reason we never set the Beam on the right Half of the Plank is, that the Plough always turns its Furrow towards the Right-hand; and the strait Side of the Share and the Coulter never go so near to a Row on the Right-hand, by the Breadth of Two Furrows, as it does to a Row on the Left-hand. If by the Drawing of the fore Horse or Horses, the Plough should bear too hard upon the Thiller, it may be helped by making a Row of Holes near the hinder Side of the Plank, for the Draw-pin, instead of those in the Middle; for the farther backwards the Draw-pin is plac’d, the less will the Limbers bear on the Thiller, especially when drawn by more Horses than one; because the fore Horses draw the Limbers more downwards than the Thiller doth, as may be seen in _Fig._ 4.