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Crucibles are available in several sizes and typically come with a correspondingly-sized lid. [20] When heated over a flame, the crucible is often held inside a pipeclay triangle which itself is held on top of a tripod. Crucibles and their covers are made of heat-resistant materials, usually porcelain, alumina or an inert metal.
Crucible An evaporating dish is a piece of laboratory glassware used for the evaporation of solutions and supernatant liquids, [ a ] and sometimes to their melting point . Evaporating dishes are used to evaporate excess solvents – most commonly water – to produce a concentrated solution or a solid precipitate of the dissolved substance.
A plate is a broad, mainly flat vessel on which food can be served. [1] A plate can also be used for ceremonial or decorative purposes. Most plates are circular, but they may be any shape, or made of any water-resistant material. Generally plates are raised round the edges, either by a curving up, or a wider lip or raised portion.
[1] These included plates, platters, tureens, sauce cups, cake stands, epergnes, wine coolers, and ice cream coolers, as well as porcelain molds not designed for food services such as etagere vases, flower vases, potpourri vases, toilet set bowls, and plaques inlaid into furniture. Two of the most famous manufacturers of rococo porcelain ...
A pipeclay triangle is a piece of laboratory apparatus that is used to support a crucible being heated by a Bunsen burner or other heat source. It is made of wires strung in an equilateral triangle on which are strung hollow ceramic, normally fire clay, tubes. The triangle is usually supported on a tripod or iron ring.
The crucibles were made by firing kaolinitic clay at temperatures greater than 1100°C, forming mullite. Mullite is an aluminum silicate only described in the 20th century and is responsible for the excellent properties of the Hessian crucible. [1] [2] Main production centre of the Hessian crucibles was the village of Großalmerode.
Some Gooch crucibles, such as the one in the drawing, permit two layers of asbestos to be used, separated by a perforated porcelain plate. [4] Other inorganic fibers, notably glass, have been used in place of asbestos. [5] Gooch crucibles made of borosilicate glass with fritted glass bases are more common today. [1]
[1] [2] Famille verte porcelain was produced mainly during the Kangxi era, while famille rose porcelain was popular in the 18th and 19th century. Much of the Chinese production was Jingdezhen porcelain , and a large proportion were made for export to the West , but some of the finest were made for the Imperial court.
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