SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Airlift pump. This device uses air to raise fluids. The air, in compressed form, is pumped down and into the fluid. This decreases the fluid density, causing it to rise. Here, the compressed air it at upper left, with the fluid raised from below stored in the tank at upper left. This design was produced by a compressed air company in Paris, France. Artwork from 'Moteurs' (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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