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Of the Coulter. 25 perfect conſtruction, and may be ſuf- ficiently underſtood, by attending to the deſcription which will now be given of this improved plough.

The ploughi, às has been alécady ob- ſérved, may bé conſidered partly as a cutting inſtrument, of wliich the coul- tér forms the edge. Tc is not employed in cutting the earth, and ſeparating ic on both ſides, in which caſe it would rather reſemble a cleaving inſtrument; but it is employed in cutting a ſmall ſlice from the firm ground, on the left hand, and removing, it to a certain diſ- tance to the right hand, Te cluet Te= liſtance being therefore exerted on the

furrow fide of the plough, the plough

1s preſled to the firm ground on the lefc

hand. By this means the land ſide of

D the