Editing Pyrometric cone (section)

{{Short description|Pyramidal ceramic specimen whose slump is proportional to the temperature reached in the kiln}}
<!-- Deleted image removed: [[Image:Figure 6.gif|frame|right|Self-supporting cones prior to firing (top) and after (bottom)]] -->
[[Image:Segerkegel.jpg|thumb|Four Seger cones after use]]

'''Pyrometric cones''' are [[pyrometric device]]s that are used to gauge [[heatwork]] during the firing of [[ceramic]] materials in a kiln. The cones, often used in sets of three, are positioned in a [[kiln]] with the wares to be fired and, because the individual cones in a set soften and fall over at different temperatures, they provide a visual indication of when the wares have reached a required state of maturity, a combination of time and temperature. 

Pyrometric cones give a ''temperature equivalent''; they are not simple temperature-measuring devices.