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It could be used as a single furrow, double furrow or triple furrow plough. The single furrow plough had one 23-inch diameter disc, the double furrow had one 23-inch disc and one 20-inch disc, while the triple furrow had three 23-inch discs. "The Petty Orchard Disc Stripping Plough is the greatest labour saver of all time.
The first plough produced by Richard Smith was a three-furrow plough he called the "Vixen". [14] [15] Later that same year, Richard Smith demonstrated a single-furrow stump-jump plough which included a chain that dragged the bottom of the ploughshare back into the ground, known as the "bridle draught".
The disk harrow is used first to slice up the large clods left by the mould-board plough, followed by the spring-tooth harrow. To save time and fuel they may be pulled by one tractor; the disk hitched to the tractor, and the spring-tooth hitched to, and directly behind, the disk. The result is a smooth field with powdery dirt at the surface.
Disc ploughs in Australia, c. 1900. A simpler, later system uses a concave disc (or pair of them) set at a wide angle to the direction of progress, using a concave shape to hold the disc into the soil – unless something hard strikes the circumference of the disc, causing it to roll up and over the obstruction.
In the mid-1930s Frank and Herbert Petty of Doncaster, Victoria, Australia developed the Petty Plough. This steerable plough could be pulled by either two horses or a tractor and the disc wheels could be steered in unison, or separately allowing the operator to plough the center of rows as well as between and around orchard trees.
Disc harrow as part of a chisel plow by Case IH. Primary heavy duty disc harrows of 265 to 1,000 pounds (120 to 454 kg) per disc are mainly used to break up virgin land, to chop material/residue, and to incorporate it into the top soil. Lighter secondary disc harrows help completely incorporate residue left by a primary disc harrow, eliminate ...
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Plan of the original single-furrow stump-jump plough. This is a timeline of Australian inventions consisting of products and technology invented in Australia from pre-European-settlement in 1788 to the present. The inventions are listed in chronological order based on the date of their introduction.