These Pins will be best to have Screws at their Ends with Nuts to them; and then they need not be so tight in the Holes, and may be the more easily taken out, when the Part B is to be taken off for avoiding Obstructions in drilling an outside Ridge.
The Cylinder is a Foot long, and about half an Inch thick, bound with an Iron Ferrel at each End; and if there were another in the Middle, it might be the stronger.
Place the Cylinder on the Outside of the Spindle, the Joint f being exactly against the Middle of the Cylinder; and mark at each End of it, in order to see when it is in its right Place; and after it is put on and pinned, mark likewise on the Spindle the exact Places of the Holes, for the more easy finding them every Time the Cylinder is put on.
Another Cylinder must be on the Joint c, held together by Pins passing thro’ the Holes i and d, in the same manner, and for the same Purpose, as the other Joint already described.
The Spindle ought to be of equal Diameter with the Bore of the Seed-boxes, thro’ which it is to pass; but this I find, needs not be quite an Inch and ³⁄₄ths; it may want an 8th of it, even in this long Spindle.
[Fig. 7.] is one of the Pins which hold the Cylinder in its Place, as has been said; a is its Head; b the Stalk, which would be better to be a Screw at its lower End, whereon to screw a Nut; but then the Stalk must be square at the Head.
[Fig. 8.] is a Sheat with its Trunk and Share of the Drill-plough, which has been described in Plates 4. and 5. but the Shape of the Share, as it rises at the Socket, is more plainly seen in this Figure.
