The Probert Encyclopaedia of Science & Technology

CRUCIBLE

A crucible is a vessel employed to hold substances which are to be submitted to a high temperature without collecting the volatile products of the action. A crucible is usually of a conical, circular, or triangular shape, closed at the bottom and open at the top, and is made of various materials, such as fire-clay, platinum, a mixture of fire-clay and plumbago, porcelain, etc.
Research Crucible