[Fig. 9.] is the whole Wheat-drill, which at present I use for planting the double Row. A is the Hopper, rising and sinking on the single Standard B, which holds it up. C is the thing like the Carrier of a Latch, described by [Fig. 22. in Plate 4.] I need say no more for describing this Drill, than to shew how it differs from that described in [Plate 4.] viz. This Hopper has Two of these Carriers, the one near its Top, like the other; and another near its Bottom, which keeps the Plough from rising at either End, without the rising of either End of the Hopper, which is no Inconvenience here; because the Two Shares, being but Ten Inches asunder, are almost the same as one; so that at the Distance the Wheels stand from each other, the rising of one Wheel doth not lift up the Share that is next to it perceptibly; as it would do if the Shares were farther asunder, or the Wheels nearer together.
This Hopper holds twice as much Seed as the single fore Hopper did, viz. half a Bushel; and is divided into Two equal Parts by the Partition e, whereby the Driller sees whether the Seed is discharged equally; and if he perceives that one Part of the Hopper runs out faster than the other, he must adjust them by the Setting-screws.
The Funnels a a, which receive the Seed from the Hopper, and convey it down into the Trunks c c, appear under the Hopper, as doth also Part of the Hole d, whereon the Funnel stood when the fore Hopper was single. D shews the Cylinder upon the grafted Spindle at one End, as F shews where the other End with its Cylinder and Wheel is taken off. The Ends of the Piece A, which guide the Harrow, appear behind the Plank at f f. At g in the Harrow-head is a Hole exactly in the Middle between the Tines, for tying on a Stone when the Harrow is too light for the Soil. Note, This Hole must follow exactly after the Middle of the Plank, i. e. between the Two Shares at an equal Distance from each.
Observe, that the Legs of this Harrow go thro’ the Head on the Outsides of the Tines, as in the treble Drill they go thro’ on the Inside of the Tines. Instead of the wooden Tines, may be put in common Iron Tines of a proper Length.
The Two Hooks whereby the Plough is drawn are at h h. ’Tis best for the Ends of the Hooks to turn upwards, so that the Links of the Chain-traces, that are to be put on them, may not be apt to drop off. Take care that these Traces be of an equal Length, which may be easily made even by the Links that are put on these Hooks.
Note, The Links of the Piece of Chain, whereby the Plough is made to go deeper or shallower, may be very small, and by no means in the Proportion they bear to the Limbers in the Cut. There need not be above Four or Five Links. If there be occasion to raise or sink the Limbers more than that Number will reach, the Cord may be tied longer or shorter on the other Limber. And when there is not the Convenience of Chain-traces, they may be supplied by a few Iron Links at the Ends of Hempen Traces.
[Fig. 10.] is the Shape of a wooden Wreath, which (when the Shares stand wider asunder, or when there are more than Two of them, so that they come nearer to the Ends of the Plank, this Wreath) is necessary to be put on the Spindle, the End a bearing against the Inside of the double Standards, and the End b being towards the Hopper. ’Tis fixt to the Spindle by the Screw c, which should not enter the Spindle above half an Inch deep. There may be another like Screw to enter in the same manner on the opposite Side of this Wreath. There must be in this case another Wreath the same of this to bear against the other double Standards. And when these Wreaths are used, the Hopper must have only the upper Carrier C; the lower one must be taken off. But in this our Drill for planting Wheat, no Wreaths must be on the Spindle, except those at b b, which are to hold the Hopper from moving endways. And these may be of the Sort above described, the End a bearing against the Hopper.
[Fig. 11.] is the Beam of the Hoe-plough described in [Plate VI. Fig. 2.] with no other Alteration than leaving out the Hole H, and the pricked Line between it and the Hole I; and changing the Hole G into a Mortise. The pricked Line a b represents the hinder Edge of the Plank, behind which appears a very small Part of a Mortise. See [p. 415], [416].