Ronketti's sympiesometer, or air barometer, 1839.
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Ronketti's sympiesometer, or air barometer, 1839.

© Science Museum / Science & Society Picture Library

Description

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.
 

Image Ref.

10313131
 

buy a print

Select size
 
Select finish
 
How many prints?
 
£20.00
 

buy a framed print

buy a canvas

buy a framed canvas