E is the Iron Crank, plac’d into the false Spindle, in the manner shewn at H in [Fig. 5. of Plate 2.] for turning the Brass Spindle by its Fork; but take care that the End of this wooden Spindle do not approach nearer to the End of the Brass Spindle than the Distance of half an Inch, left, if the inner Wreath should grow loose, the wooden Spindle might bear so hard against the Brass one, as to wrench the Seed-box down from the Wood, and then the Seed might run out betwixt the Seed-box and the Bottom to which it is screw’d.
When the hinder Side A is screw’d up against the Ends and middle Pieces, then the Box describ’d, being thrust down into the Carriage, and standing upon the describ’d Ledgers, and at that Distance from each End of the Carriage, that the Seed may drop on the Side of the Funnel, as is before describ’d; the Box is kept in its Place by one Screw passing thro’ its Back, and the back Side of the Carriage.
The Notch F is cut in the Bottom of the hinder Side of the Carriage, up to the Bottom of the Ledger, for the Convenience of seeing the Seed drop into the Funnel.
The round Notch G is made in the Bottom of the fore Side of the Carriage, to make room for one’s Hand to go in there, and turn the Setting-screw without taking off the Hopper from the Standards.
This Box and Carriage, so fix’d together, compose the Turnep-hopper, which is drawn and guided, and also holds up the Plough, by Two hollow Pieces of Wood screw’d on to the Outside of the fore Part of the Carriage; their Ends H and I appearing a little above the Carriage.
One of these hollow Pieces of Wood is shewn in [Fig. 15.] The Breadth of its Hollow must conform to the Breadth of the Standards, which are One Inch and a quarter broad; but we must allow about a quarter of an Inch more in the Hollow for the Swelling of the Wood. The Depth of the Hollow must be the Thickness of the Standard that is to go in it, allowing about the Eighth of an Inch for the Swelling of the Wood. The Hollow should be a little deeper in the Middle than at each End; because the Standard ought not to bear against any thing, except at or near the upper and lower Part of the Carriage. Altho’ the End of these Pieces come a little higher than the Carriage in this Hopper, yet I think it is better that these hollow Pieces come no higher than even with the Top, nor descend any lower than even with the Bottom of the Carriage; and then the Length of each of these Pieces need be no more than Eleven Inches, which is the whole Depth of the Carriage.
The Wood on each Side of the Hollow, sufficient for the Holes a, a, a, a, must be about half an inch broad. The best way for fixing them on, is whilst the Standards are in them, placing a small Piece of Wood at each Corner of the Hollow, betwixt the Standard and the Wood, to the end that there may be no more room on one Side of a Standard than on the other Side; then screw them on (parallel to and equidistant from their respective Ends of the Carriage) by Four small Screws each, the one at c, c, c, c, and the other at d, d, with Two below; the Heads of these Screws being on the Inside of the Carriage, and their Nuts on the Outsides of the hollow Pieces; then pull out those little Pieces of Wood, that were to keep the Standards in the Middle of the Hollows, whilst the Holes for the Screws were bored, and then the Turnep-Hopper is finished, and being put on upon the Standards A, B, in [Fig. 16.] is ready to go to Work; and in this Figure the whole Turnep-drill may be seen as in the Prospect of a Person following it at Work, except that this Figure has not the double Standard, nor Marking-wheels; because we never use them for drilling-Turneps, except it be on the Level, which we very rarely do.
The Circles of the Wheels of this Hopper go Twenty five Inches asunder; were they farther asunder, they would not go so well upon the Ridges; or were they nearer together, they might not hold up the Plough so steadily, but that one Wheel might happen to be rais’d from the Ground, by the descending of the opposite Limber; and if it should happen to be the Wheel that turns the Crank, no Seed would be deliver’d out whilst the Wheel was rais’d above the Ground; sometimes we use Wheels of Twenty-six Inches Diameter, sometimes Thirty, and at intermediate Diameters, with this Hopper.