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Ronketti's sympiesometer, or air barometer, 1839.

Ronketti's sympiesometer, or air barometer, 1839.
4 0 c m
actual image size: 25cm 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 Carpenter and Westley to a design registered by Ronketti in 1839.

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