Wedgwood scale

1783 Wedgwood scale

The book of science

Tom Sharp

Josiah Wedgwood thermometry

Wedgwood scale

The scale

Workable degrees

Wedgwood’s pyrometer was horribly inaccurate; however, at least it didn’t melt or have its parts weld together in high temperatures. His metal plate with the scaled bars was not necessarily put into the kiln with the disk of clay, because the disk of clay would not expand again as it cooled.

See also in The book of science:

Readings in wikipedia: