I have also made use of it for the same Purpose in the Middle of a cloddy Field, where it pulveriz’d the Clods so effectually, that the Benefit of it might be plainly distinguish’d by the Colour and Strength of the Two following Crops, different from the other Parts of the Field adjoining on both Sides, whereon the Roller was not drawn.
But crushing has such a contrary Effect from squeezing, that if this Roller should be us’d when the Land is moist, it would be very pernicious, by unpulverizing it; of which I am so cautious, that sometimes I let the Roller lie still for a whole Year together.
There is also a long triangular Harrow, which is sometimes useful in the Intervals when the Earth is of a right Temper betwixt wet and dry; but there is no need to describe it, and I scarce use it once in Two or Three Years.
The Diameters of the wooden and iron Pins and Screws, with their Holes, and the Sizes of the Nails to be made use of in all the describ’d Instruments, I leave to the Discretion of the Workmen, who, if they are Masters of their several Trades, cannot be ignorant of such Matters.
[Fig. 7.] and [Fig. 8.] shew the Lands of Turneps mention’d at the Beginning of this Work.
AN
APPENDIX
CONCERNING
The making of the Drill,
and the Hoe-Plough, &c.
To a Workman, who would make these Instruments, I would add the following Directions.