OM cs ey

ON THE PLOUGH. 4

the left of that of the force; and, confe- quently, its tendency been towards the firm ground. Had it been lefs, its direction muft have pointed to the oppofite fide, and its tendency onthat account been towards the ploughed land.

The right fide of the plough deviates confiderably from the form of the inclined

fide of the half-wedge. It is not, like the

latter, perpendicular, but inclined a little to the horizon; by which means the plough now takes the figure of a half-wedge, whofe

. upper edge is narrower than its lower. The

defign of this part of its conftruction is to raife and turn the earth; for, as the plough is wider below than above, it firft infinuates its loweft and moft inclined part below the neareft fide of the earth of the furrow, rai- fes that fide gently up, and, penetrating full farther as it proceeds, gradually turns the earth over. Had the right fide of the plough been perpendicular to the horizon, or exaétly in this refpect refembled the wedge, it could not have raifed or turned the earth of the furrow, but muft have cut the earth out, and pushed it afide, with the B.?- fame