A plow with a short and quite straight moldboarddoes not bury manure and turf in the bottom of the furrow so completely as is the case with a long, curved moldboard.
To produce a chilled moldboard was the one particular achievement of James Oliver.
For a moldboard that always scours gives a peace to a farmer like unto that given to a prima donna by a dress that fits in the back.
An Oliver moldboard has little checkerboard lines across it.
Every few minutes the plowman had to scrape off the soil from the moldboard with his boot-heel or stick or paddle.
He had a moldboard nearly as bright as a diamond and about as hard, one that "sang" at its work.
The Big Idea of chilled metal for the moldboard of a plow, probably had its germ in the mind of James Oliver from this very passage of Scripture.
The desirable and necessary thing was to preserve the exact and delicate shape of the moldboard so that it would scour as bright as a new silver dollar in any soil, rolling and tossing the dirt from it.
To make a moldboard as finely tempered in its way as a "Toledo blade" was his ambition.
In clay soils these ploughs did not work well, as the more tenacious soil stuck to the iron moldboard instead of curling gracefully away.
The moldboard was rough and the curves of no two were alike.
In 1833, John Lane, a Chicago blacksmith, faced a wooden moldboard with an old steel saw.
A rolling disk takes the place of the moldboard and share, and in this way friction is reduced very materially, with the result that less tractive effort is required to draw the machine.
As the furrow slice slides over the moldboard of the plow the soil is pulverized by friction.
The stubble plow has a moldboard with less twist than that of the sod plow.
There is the same friction between the moldboard and the furrow slice as in the case of the walking plow, but the wheels are intended to materially reduce the pressure on the furrow bottom and against the land side.
The moldboard of a plow must be smooth in order to properly shed the earth freely to make an easy turn-over.
We can observe the effect that a rough, or badly scratched, or poorly shaped moldboard has on any kind of soil, especially when passing from gravelly soils to clay.
The furrow slice sliding over a perfect moldboard leaves the surface of the upturned ground as even as the bottom of the furrow.
The track made in the bottom of the furrow with the walking plow shows plainly the heavy pressure of the furrow slice on the moldboard by the mark of the slip.
Later the art of molding steel was studied and perfected until many grades and degrees of hardness were produced and the shape of the moldboard passed through a thousand changes.
A field plowed with a defective moldboard will be full of these places.
The shape of the shear and the forward part of the moldboard is primarily that of a wedge, but the roll or upper curve of the moldboard changes according to soil texture and the width and depth of furrow to be turned.
The action of the plow is that of a wedge with the power pushing the point, the share and the moldboard between the furrow slices and the land side and the furrow bottom.
Fifty years ago a farmer was lucky if he owned a singlemoldboard cast-iron plow that he could follow all day on foot and turn over one, or at most, two acres.
This shows that the soil is slipping off the moldboard easily.
The second argument is the shape of the moldboard itself.
The whole face of the moldboard and share is ground smooth, so that it scours perfectly bright in any soil, and will not choke in the foulest of ground.
The question of the material in the moldboard of the 1838 plow was answered when a spark-test analysis was made of the metal in the moldboard and share.
The successful prairie plow with a smooth one-piece moldboard and steel share was basically Deere's idea.
If, however, Deere had used a large circular saw with plenty of room for cutting out a moldboard of the usual shape and size, it seems likely that he would have made a plow of more conventional appearance.
Of what material is the moldboard of the 1838 plow made?
The filing of the edge of the moldboard for the metallurgical test disclosed that the wrought-iron slab consisted of five thin laminations apparently forged together but with separations visible.
The share cuts a broad, shallow strip of sod which the long, gently curving moldboard turns over unbroken.
The emphasis is always on the development of a steel moldboard and the assumption is that from the 1837 plow onward stretched an unbroken line of steel moldboard plows.
The moldboard and share could rotate on a horizontal axis.
The disks, set at an angle, cast less furrow than a moldboard plow.
The model has a share, standard, and moldboardof metal with a gauge wheel on the beam.
The Tavenner plow has a cast-iron moldboardand a wrought-iron share and colter.
The moldboard of this plow is made of wood and covered with thick pieces of iron.
The share and point are in one piece; and the moldboard is one piece.
Its moldboard was based on a design worked out by Thomas Jefferson.
The long fingers of the moldboard helped break the sod further.
The moldboard plow is, everything considered, the most satisfactory plow for dry-farm purposes.
Davidson and Chase say, however, that the draft of a disk plow is often heavier in proportion to the work done and the plow itself is more clumsy than the moldboard plow.
For ordinary dry-farm purposes the disk plow has no advantage over the modern moldboard plow.
Subsoiling is accomplished in two ways: either by an ordinary moldboard plow which follows the plow in the plow furrow and thus turns the soil to a greater depth, or by some form of the ordinary subsoil plow.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "moldboard" in a variety of sentences. We hope that you will now be able to make sentences using this word.
