or lowered, or moved to right or left. With some plows the width of
the furrow is adjusted by moving the beam at its attachment to the
handles.

_A share_, called by some the point, which shears the bottom of the
furrow slice from the land. The share should be sharp, especially for
plowing in grass land and land full of tough roots. If the share,
particularly the point, becomes worn so that it bevels from beneath
upwards it will be hard to keep the plow in the soil, for it will tend
to slide up to the surface. If this happens the share must be renewed
or sharpened. Plows are being made now with share and point separate,
and both of these reversible (Fig. 51), so that if either becomes worn
on the under side it can be taken out and turned over and put back and
it is all right, they thus become self-sharpening.

_A mouldboard._ This turns and breaks the furrow slice. The degree to
which the mouldboard pulverizes depends on the steepness of its slant
upward and the abruptness of its curve sidewise. The steeper it is and
the more abrupt the curve, the greater is its pulverizing power. A
steep, abrupt mouldboard is adapted to light soils and to the heavier
soils when they are comparatively dry. This kind of a plow is apt to
puddle a clay soil if it is quite moist. For breaking new land a plow
with a long, gradually sloping share and mouldboard is used.

_A landslide_, which keeps the plow in place.

_A coulter._ Some plows have a straight knife-like coulter (Fig. 52)
which is fastened to the beam just in front of the mouldboard and
serves to cut the furrow slice from the land. In some plows this is
replaced by an upward projection of the share; this is wide at the