pyrometric cones

pyrometric cones
   Ceramic clay wedges placed inside a kiln before firing. (Bar shapes are also available.) At a certain temperature a cone will bend, so by constant observation it can be determined at what point particular temperatures are reached in the kiln. Used in a Kiln-Sitter, electricity is turned off to the kiln when the cone placed in it bends. The E. Orton Jr. Ceramic Foundation advises using a particular set of temperature equivalents for their cones, which melt at 34 different temperatures, each identified with its own cone number: starting at 022 at the lowest temperature (1157 degrees F.), continuing to cone 01, then to cone 1, and to the hotest at cone 12 (about 2420 degrees). Orton cones come in two regular sizes, temperatures varying between them slightly, rarely significantly. Number 06 large regular cones bend at 1830 degrees F., and small regular cones at 1873. Number 04 large regular cones bend at 1940, and small regular cones at 2008. Clay must be fired at a higher temperature to bisque than any subsequent firing for glazes. A triangle is often used as a glyph for "cone."

Glossary of Art Terms. 2014.

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  • Pyrometric cone — Pyrometric cones are pyrometric devices that are used to gauge heatwork during the firing of ceramic materials. The cones, often used in sets of three as shown in the illustration, are positioned in a kiln with the wares to be fired and provide a …   Wikipedia

  • Pyrometric device — Pyrometric devices gauge heatwork (the combined effect of both time and temperature) when firing materials inside a kiln. It is important to note pyrometric devices do not measure temperature, but can report temperature equivalents. The intention …   Wikipedia

  • pyrometric cone equivalent — noun a measure of the melting point of refractory materials, based on the use of pyrometric cones. Abbrev.: p.c.e …  

  • pyrometric cone — noun a pyrometer consisting of a series of cones that melt at different temperatures • Hypernyms: ↑pyrometer …   Useful english dictionary

  • Orton Ceramic Foundation — The roots of the Orton Ceramic Foundation date back to the establishment of the Standard Pyrometric Cone Company in 1896 by Dr. Edward J. Orton, Jr.. Dr. Orton was a pioneer in developing and applying scientific principles to ceramic… …   Wikipedia

  • pyrometrical — adjective see pyrometric * * * pyrometric /pī rō metˈrik/ or pyrometˈrical adjective (pyrometric cones same as ↑Seger cones) • • • Main Entry: ↑pyro …   Useful english dictionary

  • cone —    , cone number    a measure of temperature used by potters. Pyrometric cones are cone shaped objects designed to soften and bend after absorbing a specific amount of heat. Potters place these cones in the kiln and observe them through… …   Dictionary of units of measurement

  • Heatwork — is the combined effect of temperature and time. It is important to several industries:*Ceramics *Glass and metal annealing *Metal heat treatingPyrometric devices can be used to gauge heat work as they deform or contract due to heatwork to produce …   Wikipedia

  • Orton Cone Box Show — The Orton Cone Box Show [7] is a biennial ceramic art exhibition for small work that started in Indiana, United States and is now held in Kansas, United States. It is open to submissions from across the world. The show s title is taken from the… …   Wikipedia

  • traditional ceramics — Introduction       ceramic materials that are derived from common, naturally occurring raw materials such as clay minerals and quartz sand. Through industrial processes that have been practiced in some form for centuries, these materials are made …   Universalium

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