Distillation of oil of vitriol also known as sulphuric acid, 1651. Iron retort with cover, detail at C,D, is placed in furnace and connected to receiver at A. At B the operator is removing pot lid with tongs and inserting ingredients with a ladle. This process entailed prolonged heating. At E is a pot placed directly on the fire rather than in furnace. From 'A Description of New Philosophical Furnaces', by Johann Rudolph Glauber. (London 1651). First English edition, translated by John French. Woodcut.

Distillation of oil of vitriol also known as sulphuric acid, 1651. Iron retort with cover, detail at C,D, is placed in furnace and connected to receiver at A. At B the operator is removing pot lid with tongs and inserting ingredients with a ladle. This process entailed prolonged heating. At E is a pot placed directly on the fire rather than in furnace. From 'A Description of New Philosophical Furnaces', by Johann Rudolph Glauber. (London 1651). First English edition, translated by John French. Woodcut.

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