These Self Supporting Orton Pyrometric Cones are used on a shelf inside a kiln to determine when a firing is complete, if the kiln provided enough heat or if there was a problem during the firing. This style of cone does not require a cone holder. These Orton cones are made from carefully controlled compositions so that they bend in a repeatable manner over a very small temperature range. When the cone tip reaches a point level with the base it indicates it is properly fired.
Fixed mounting height and angle
No need for cone holder
Most accurate way to control ceramic firing
Orton has been manufacturing since 1896