They measure the amount of heat energy in that part of the kiln where they are placed, by a controlled contraction, dependant on the amount of heat energy received. This is  measurement is recorded as a simple series of numbers. These numbers are not only a measure of the temperature in that part of the kiln, but a measure of all the factors which  add up to the total heat energy applied to the product. So Bullers Rings give a simple,  easy to use and economic way of measuring the uniformity acros s a kiln, and consistency of repeated firings in intermittent kilns as well as consistency in continuous kilns.

      How are Bullers Rings used?

 Simply place Bullers Rings in those positions on the kiln where measurements of heat   energy are wanted. Fire the kiln, and after firing, measure the contraction using the special   gauge. Record the readings and the positions of the rings on the kiln. Uniform reading  show consistent firing; a wide spread of numbers shows an inconsistent firing, giving poor  quality product. It is not necessary to convert the readings to “approximate temperature”.

      Why put Bullers Rings in your kiln?

• Improved consistency
• Improved yield
• Improved quality
• Improved profit