Pyrometric cones are pyrometric devices that are used to gauge Heatwork during the firing of ceramic materials. The cones, often used in sets of three, are positioned in a kiln with the wares to be fired and provide a visual indication of when the wares have reached a required state of maturity, a combination of time and temperature. Thus, pyrometric cones give a temperature equivalent; they are not simple temperature-measuring devices.
Bibliography
“Pyrometric Cone.” 2022. Wikipedia, February. https://en.wikipedia.org/w/index.php?title=Pyrometric_cone&oldid=1069877838.