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Plough
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====Iron ploughshare==== An advance on the basic design was the iron ploughshare, a replaceable horizontal cutting surface mounted on the tip of the share. The earliest ploughs with a detachable and replaceable share date from around 1000 BC in the [[Ancient Near East]],<ref>K. D. White (1984): ''Greek and Roman Technology'', London: Thames and Hudson, p. 59.</ref> and the earliest iron ploughshares from about 500 BC in China.<ref name="greenberger 2006 11-12">Robert Greenberger, ''The Technology of Ancient China'' (New York: Rosen Publishing Group, Inc., 2006), pp. 11β12.</ref> Early mould boards were wedges that sat inside the cut formed by the coulter, turning over the soil to the side. The ploughshare spread the cut horizontally below the surface, so that when the mould board lifted it, a wider area of soil was turned over. Mould boards are known in Britain from the late 6th century onwards.<ref>Hill and Kucharski 1990.</ref> [[File:Aratro 1849.jpg|thumb|19th century ploughs]]
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