Harrows are used to disintegrate and pulverize the ground after ploughing.
Several forms of these implements are presented herewith.
Fig. 30 is the ordinary square harrow;
Fig. 31, the Friedmann harrow; and
Fig. 32, the Scotch harrow.
For land containing many fibrous roots, or much stiff clay, the
disk or wheel harrow represented in Fig. 33 is used. The wheel-gangs (that is to
say, the shafts to which each row of disk& is fixed) are attached to the pole and
draught-bars by the ball-joint shown at A, so that each gang is free to conform by its own
weight to the shape of the ploughed land-surface. The operation of this harrow is that of
cutting and separating rather than of scratching, as in the case of spike-harrows
The shares harrow (Fig. 34) is especially adapted for pulverizing
the freshly-inverted surface of sward-land, to a depth two or three times as great as the
common harrow can effect The teeth, being sharp, flat blades, cut with great efficiency;
and as they slope like a sled-runner, they pass over the sod, and instead of tearing it up
like the common harrow or gang-plough, they tend to keep it down, and in its place,
while the upper surface of the sod is sliced up and torn into a fine, mellow soil
Your Comments Welcomed! Copyright © 1995 Roger Corrie