Pyrometric device

Pyrometric devices gauge heatwork (the combined effect of both time and temperature) when firing materials inside a kiln.

In principle, a pyrometric device relates the amount of heat work on ware to a measurable shrinkage or deformation of a regular shape.

In 1782, Josiah Wedgwood created an accurately scaled pyrometric device working (see Wedgwood scale for details), with details published in the Philosophical Transactions of the Royal Society of London in 1782 (Vol.

Originally developed by the company named Bullers, the current manufacturers, Taylor Tunnicliff Limited, were founded in 1867.

The plant is now owned by Ferro and moved to its current location in St Dizier, France in 2010.

Buller Rings that were placed at top and bottom of a kiln
Four Seger cones after use