Air barometer or 'sympiesometer', 1858.
4 0 c m
actual image size: 26cm x 32cm

Air barometer or 'sympiesometer', 1858.

© Science Museum / Science & Society Picture Library


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. The air barometer was also known as the sympiesometer. This example was made by L Casella.

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