Faculté des sciences

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

Eramo, Giacomo

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

Fragments of the melting furnace and several crucibles of the glassworks of Derrie`re 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,... Plus

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    Summary
    Fragments of the melting furnace and several crucibles of the glassworks of Derrie`re 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.