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- Lehr_(glassmaking) abstract "A lehr is a temperature-controlled kiln for annealing objects made of glass. The name derives from the German verb lehren meaning to teach and is cognate with the English lere also meaning to learn or acquire knowledge of (something).Rapid cooling of molten glass generates an uneven temperature distribution in the body of the glass which results in mechanical stress sufficient to cause cracking before the object has reached ambient temperature, or to result in susceptibility to cracking in later use, often resulting from thermal shock. To prevent this, objects manufactured from molten glass are annealed by cooling gradually in a lehr from a temperature just below the solidification point of the glass. Anneal cooling rate depends on the thickness of the glass, and can range from several tens of degrees Celsius per hour for thin sections to a fraction of a degree Celsius per hour for thick slabs or castings.In glass manufacture, a lehr is typically a long kiln with a temperature gradient from end to end, through which newly made glass objects such as glasses or vases are transported on a conveyor belt. However, the same effect can be obtained in a small kiln by controlling the cooling rate with an electronic temperature controller.".
- Lehr_(glassmaking) wikiPageID "14286576".
- Lehr_(glassmaking) wikiPageRevisionID "589685403".
- Lehr_(glassmaking) hasPhotoCollection Lehr_(glassmaking).
- Lehr_(glassmaking) subject Category:Glass_art.
- Lehr_(glassmaking) subject Category:Glass_engineering_and_science.
- Lehr_(glassmaking) subject Category:Kilns.
- Lehr_(glassmaking) type Area102735688.
- Lehr_(glassmaking) type Artifact100021939.
- Lehr_(glassmaking) type Chamber103003730.
- Lehr_(glassmaking) type Enclosure103285912.
- Lehr_(glassmaking) type Furnace103404449.
- Lehr_(glassmaking) type Kiln103617095.
- Lehr_(glassmaking) type Kilns.
- Lehr_(glassmaking) type Object100002684.
- Lehr_(glassmaking) type PhysicalEntity100001930.
- Lehr_(glassmaking) type Structure104341686.
- Lehr_(glassmaking) type Whole100003553.
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- Lehr_(glassmaking) type YagoPermanentlyLocatedEntity.
- Lehr_(glassmaking) comment "A lehr is a temperature-controlled kiln for annealing objects made of glass.".
- Lehr_(glassmaking) label "Lehr (glassmaking)".
- Lehr_(glassmaking) sameAs m.03c_dln.
- Lehr_(glassmaking) sameAs Q6518953.
- Lehr_(glassmaking) sameAs Q6518953.
- Lehr_(glassmaking) sameAs Lehr_(glassmaking).
- Lehr_(glassmaking) wasDerivedFrom Lehr_(glassmaking)?oldid=589685403.
- Lehr_(glassmaking) isPrimaryTopicOf Lehr_(glassmaking).