A woodcut engraving depicting a method of producing nitric acid (aqua fortis) by placing equal weights of nitrate of soda and sulphuric acid in a retort and applying heat. The nitric acid collected in the receiver (left) which had a cold water jacket. Dated 19th century
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Caption:
A woodcut engraving depicting a method of producing nitric acid (aqua fortis) by placing equal weights of nitrate of soda and sulphuric acid in a retort and applying heat. The nitric acid collected in the receiver (left) which had a cold water jacket. Dated 19th century
Credit:
Album / Universal Images Group / Universal History Archive