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Hydrogen gas production plant. French engineer and balloonist Henri Giffard. The wooden barrels contain sulphuric acid reacting with iron to produce hydrogen gas that passes along tubes to be washed (vessel at lower centre), then dried (lower left), and finally checked for temperature and dryness (bottom left). One cubic metre of hydrogen is made from 3kg of iron and 5kg of sulphuric acid. Artwork from 'Aerostation - Aviation' (1911) by French civil engineer Max de Nansouty (1854-1913), part of the 'Les merveilles de la science' series of 1867-1891 by Louis Figuier.
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