Faculté des sciences

## Pre-industrial glassmaking in the Swiss Jura: the refractory earth for the glassworks of Derrière Sairoche (ct. Bern, 1699–1714)

### In: Geological Society, London, Special Publications, 2006, vol. 257, p. 187–199

Fragments of the melting furnace and several crucibles of the glassworks of Derriere Sairoche are compared with local raw materials. Principal component analysis (PCA) based on the chemical composition and on the grain-size distribution of the archaeological and natural materials demonstrates that the analysed samples were made from the same raw material and that local clayey sands (Hupper,... More

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Summary
Fragments of the melting furnace and several crucibles of the glassworks of Derriere Sairoche are compared with local raw materials. Principal component analysis (PCA) based on the chemical composition and on the grain-size distribution of the archaeological and natural materials demonstrates that the analysed samples were made from the same raw material and that local clayey sands (Hupper, Side´rolithique) were exploited. Availability in situ of good raw materials made tempering unnecessary. Their high melting point (c. 1600°C) allowed good performance in service conditions at temperatures up to 1500°C. Moreover, because of low Fe₂O₃tot concentrations, batch-glass contamination was avoided.