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ent height above the furface, to avoid the interruptions to which it might otherwife be expofed; and therefore, fuppofing the downward tendency of the plough deter- mined, and the upward direction of the force.neceflary to balance it, the beam muft be made longer or fhorter, till its point fall into a point of the height required in the inclined line of the force. Now, the greater the downward tendency, the more upward muft be the dire&tion of the force; and, confequently, the fooner muft the beam meet with it, that is, muft be the fhorter. On the other hand, the lefs downward the tendency, the lefs upward will be the direc- tion, and the farther muft the beam be ex- tended befere it meets with that line, and confequently will be the longer.

This do&rine would be exaCtly confor- mable to fat, and the ploughs with the more inclined coulters would always have the fhorter beams, and thofe with the. lefs inclined ones the longer, were it not that the dire€tionof the force may eafily be changed, by yoking the cattle nearer or farther

from the point of the beam. Hence it hap- pens,