Of the Coulter, 29 of the ſheath and mould-board. Theſe conditions- cannot be obtained, if the beam is equally tapered on the land and furrow ſides, as is uſually praiſed. For, in this caſe, the coulter will have its UpPer Part rémoved to the right hand of the land ſide of the plough by half the thickneſs of the beam. This is ac- cordingly the caſe inthe uſual conſtruc- tion of the plough; and this defed is attempted to be remedied, by placing the plane of the coulter, not upright, but pointing with its lower end to the land, and projeâting beyond the land ſide of the plough near five inches, as in fig. 3, 4, and 9. which repreſent a crols ſection of the plough at the heel, ſeen from the point of the beam. I ſhall firſt deſcribe the conſtrudion,

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