On THE PLOUGH WwW

which may probably be found to be the cafe, that the plough which requires the leaft force cannot have all other circumfances equal, the next inquiry will be, how to form compenfations, fo that the effect of thefe de- trimental circumftances may be felt as little as poflible.

With a view to determine the firft of thefe points, namely, the form of the plough moved by leaft force, all the pains already taken to reduce it to the figure of a half wedge have been beftowed. The deviati- ons, though very confiderable, were not fo great as to invalidate any confequences drawn from the one to the other; becaufe they changed a little the regular figure, without altering at all, or very little, the manner of operation; and it is evident that a change in the latter only can have any confiderable effe& upon the common con- clufions. But, although the differences in figure fhould have a greater effect than can reafonably be fuppofed, yet they cannot be fo confiderable as to produce any mate- rial error in practice. It is furely not necef- fary to obferve, that the common method of

moving