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Nooth's apparatus, c 1775.

© Science Museum / Science & Society Picture Library

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This apparatus was originally designed by Dr Nooth, as suggested by Joseph Priestley, to prepare water containing carbon dioxide. The bottom vesel contains chips of marble to which dilute sulphuric acid was added. Carbon dioxide was given off and this pased into the middle vesel which contained water in which some of the carbon dioxide disolved. A valve arrangement allowed the gas to move upwards but did not allow the water to move downwards. When the water was needed, it was drawn off using the tap in the middle vesel. Nooth's apparatus was superseded by a new proces invented by a German immigrant in London called Schweppe.
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