Pyrometric devices gaugeheatwork (the combined effect of both time and temperature) when firing materials inside akiln. Pyrometric devices do not measure temperature, but can reporttemperature equivalents. In principle, a pyrometric device relates the amount of heat work on ware to a measurable shrinkage or deformation of a regular shape.
Care should be taken with the interpretation, as some naively assume they are a measure of temperature alone.
In 1782,Josiah Wedgwood created an accurately scaled pyrometric device working (seeWedgwood scale for details), with details published in the Philosophical Transactions of the Royal Society of London in 1782 (Vol. LXXII, part 2). This led him to be elected a fellow of theRoyal Society.[5][6][7][8][9]
The modern form of the pyrometric cone was developed by the German ceramics technologistHermann Seger and first used to control the firing of porcelain wares at theKönigliche Porzellanmanufaktur (Royal Porcelain Works) in Berlin, in 1886.Seger cones are still made by a small number of companies and the term is often used as a synonym forpyrometric cones.
Holdcroft Bars were developed in 1898 by Holdcroft & Co.[10]
Bullers rings have been in continuous production for over 80 years, and are currently in use in over 45 countries. Originally developed by the company named Bullers, the current manufacturers,Taylor Tunnicliff Limited, were founded in 1867.[11]
TheStandard Pyrometric Cone Company was founded byEdward J. Orton, Jr. in 1896.
PTCR rings (Process Temperature Control Rings) were originally called "Phillips Temperature Control Rings" and developed by Phillips Electronics in Uden, Netherlands. The plant is now owned by Ferro and moved to its current location in St Dizier, France in 2010.
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