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Air trapped within the clay body needs to be removed.
This is called de-airing and can be accomplished either by a machine called a vacuum pug or manually by wedging.
A sophisticated economic system in imperial China gave birth to inventions such as paper money during the Song Dynasty (960–1279).
The invention of gunpowder during the mid 9th century led to an array of inventions such as the fire lance, land mine, naval mine, hand cannon, exploding cannonballs, multistage rocket and rocket bombs with aerodynamic wings and explosive payloads.
Major types of potterywares include earthenware, stoneware and porcelain.
The list below contains these and other inventions in China attested by archaeology or history.
In the museum’s collection, discoveries made during the exploration of the Bandužiai burial ground are stored.
The burial ground is situated in the former Bandužiai village south-east of Klaipėda. Records from 1931–1939 of the Klaipėda Regional Studies Museum (now the History Museum of Lithuania Minor) include 101 items from the Bandužiai burial ground.
Wedging can also help produce an even moisture content.
Once a clay body has been kneaded and de-aired or wedged, it is shaped by a variety of techniques. There are several materials that are referred to as clay.