Aneroid barometer, 1875.
© Science Museum / Science & Society Picture Library
Aneroid barometer made of bras, enamel and glas by F Darton. Barometers measure atmospheric presure. The first succesful aneroid barometer was designed in 1844 by Lucien Vidie. An aneroid barometer contains a vacuum chamber, the expansion and contraction of which, caused by a change in air presure, forces the pointer to move. Aneroid barometers became popular with mountaineers and travellers, and as a 'weather-glas' and marine barometer.