Large Pyrometric Cones allow users a practical method to monitor the heatwork (the effect of temperature and time at temperature) inside their kiln. Today they are used by quality conscious manufacturers who want a visual indication of the heatwork in locations throughout their kiln.
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Large cones must be mounted in a plaque with the cones mounted at 8 angular degrees. Plaques can be made by hand or purchased through Orton. Orton stocks both 3 hole and 4 hole plaques.
 
Cones are recommended by glaze and kiln manufacturers to achieve the best results.