THE MELTING FURNACE OF THE DERRIÈRE SAIROCHE GLASSWORKS (COURT, SWISS JURA): HEAT‐INDUCED MINERALOGICAL TRANSFORMATIONS AND THEIR TECHNOLOGICAL SIGNIFICANCE*

Abstract

Seventy‐one oriented specimens from the pre‐industrial reverberatory melting furnace of the Derrière Sairoche glassworks (Swiss Jura) were analysed. During its period of activity (1699–1714), this glassworks produced wood‐ash glass of liquidus temperatures up to 1400°C. Textural and mineralogical features point to temperatures around 1500°C in the melting chamber. The inner structure of the furnace shows chemical contamination due to ash, molten glass and furnace gases. These results reveal the pyrotechnological know‐how of the glassmakers and prove that the thermal performance of this kind of furnace has been under‐evaluated in the past.

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