Glossary
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Reference —  Pyrometric cones
Small pyramids of ceramic materials formulated to bend over and melt at designated temperatures. Orton cones in the United States and Seger cones in England and Europe have different ranges. In addition to the brown and white Orton cones that range from cone 022 to cone 42 (for industrial use), there are now cones that contain color coding to avoid confusion.

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