[Fig. 3.] Shews the right-hand Side, and upper Side of the Four-coulter Plough, of which V the Iron Ground-wrist is shewn in [Fig. 9.] long Two Feet Five Inches, deep at the End b Four Inches, and Three-eighths of an Inch thick, except at the End a, where it is thin enough to bend, so as to fit close to the Share, as at e, in [Fig. 6.] The Ground-wrist has Four small Holes near its End a, into one of which goes a Nail, to fasten it to the Shear, thro’ the long Hole in the Side of the Socket of the Share, as at a, in [Fig. 10.] and then it will stand in the Posture shewn by e f, in [Fig. 6.] From the Outside of the Ground-wrist at f, to the Outside of the Share at b, is Eleven Inches and an half, which is the Width of the lower Part of the Plough-tail at the Ground; the Ground-wrist has several Holes at the upper Side of its broadest End, as at b, in [Fig. 9.] by which it is nailed to the lower Part of the Drock T, as in [Fig. 3.] which Drock with its Perforations is shewn in [Fig. 11.]
[Fig. 12.] Is the Earth-board, with its Inside upwards; the Notch a b shews the Rising of the Wood, which takes hold of the Edge of the Sheat, to hold it the firmer, to which it is fastened by the Holes c and d; and at the other End it is fastened to the Drock, at the Hole e. All which is seen as it stands mark’d with W, in [Fig. 3.] But this Pin, with which it is fastened to the Drock, is bigger in the Middle than at each End; which prevents the Earth-board from coming near the Drock: By this Pin, the Earth-board is set at a greater or less Distance from the Drock, as there is Occasion to throw off the Furrow farther from the Plough at some times than at others: It always stands considerably farther out on the right Hand than the Ground-wrist does, which is one Reason that the Drock is made crooked, bending outwards in that Part.
