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One of a series of pyramidal-shaped pieces consisting of mineral mixtures and used for measuring time-temperature effect. A standard pyrometric cone is a three side truncated pyramid; and is approximately either 25/8inches high by 5/8inch wide at the base or 11/8inches high by 3/8inch wide at the base. Each cone is of a definite mineral composition and has a number stamped on one face; when heated under standard conditions it bends at a definite temperature.