Firing Supplies - Cones - BigCeramicStore.com
FIRST A DESCRIPTION: 1) It is a physical object. A tall, narrow, pyramid-shaped piece of clay that is used to observe the temperature (actually the "heat-work") accomplished in a kiln. 2) It is also unit of measure, like feet or inches. In this usage, it is a way of describing how much "heat-work" is required for a certain firing process in a kiln.