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Sympiesometer, or air barometer, 1845-1851.

Sympiesometer, or air barometer, 1845-1851.
4 0 c m
actual image size: 26cm x 32cm


Mercury barometers needed to have two tubes that were at least 33 inches long, and were generally cumbersome to carry around. To allow for readings of air presure by a pocket instrument, a much shorter glas tube was doubled back on itself to fit a small case, and the moving agent was a combination of air, spirit and mercury. This example was made by Stebbing of Southampton.

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© Science Museum / Science & Society Picture Library

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