10 Implements of Hufoandry—Two-Furrow-Ploughs.

of the cattle, but is equally advantageous in increafing the ftrength of the im. plement.

It is{till further remarked, that this fort of plough has lately been found ufeful in his own country, in even breaking up ley-ground, although formerly only in com- mon ufe for fallowing, not being thought capable of ploughing leys, as, from their conitruction, requiring too great ftrength in the team; and that a premium has lately been given for this fort of plough, working ley-ground only. He ftates alfo, that one acre and an half of ley-ground was broken up by four oxen with great eafe to them- felves in three hours and fifty-five minutes, they having, as part of a conftant courfe of work, ploughed feventeen perches fhort of an acre of the fame kind of ground the fame morning: this was performed in order, he fays, to prove the effect of moveable plates at the extremities of the mould-board, that the furrows might be laid more or lefs flat; as mould-boards formed to lay furrows in ley, fo as to give the greateft quantity of mould or foil to harrows, cannot be of that fhape or form bett fuited to make good work in ftirring earths, more efpecially the laft, which ought tobe thrown up in{mall feams, as it were, that the feed may be properly buried. For this purpofe it has, he afferts, hitherto been ufual to rip off the plate and drive in wedges, by which the mould-plate mutt be liable to be injured; and from the trouble attending the operation, it has often been omitted, and confequently the land imperfectly worked. This inconvenience may, he fays, be remedied, and the mould-board be adjufted with great facility and expedition, by having the neceflary parts of the mould-board or plate cut off, and afterwards conneéted with the fixed parts of it. by

means of flat hinges, or of thin flexible plates of tempered fteel, or of hard ham-.

mered iron, fo as to admit of thefe parts being fet to hav with the fixed part of the mould-board.

e different inclinations By means of two fcrews pafling from the infide through the lower parts of the handle of the plough, oppofite the back parts:

of thefe moveable pieces,. they may be kept at any defired degree of inclination ac-

cording to the nature of the work to be performed. As.ley-grounds.cannot be laid too flat, or feed earths-too much on an edge,,

by this improvement in the mould.. board of thefe ploughs he thinks it m

ay be readily adjufted for either purpofe, as.it may be rendered more flat or more convex, according to the circumftances of the cafe. That part of the mould-plate the moft liable to wear fhould be made. of double the thicknefs. of the others, in order to render it as durable as the reft of the plough.. The increafed weight of draught when thefe moyeabl

€ plates were extended, cid not appear, he obferves, on trial, in

a two-furrow-plough, to be, by the cops,. more than twelve pounds, in ley-ground at fix inches depth. The friction in fur.

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