Saussure Hygrometer

A rare hair hygrometer to the Saussure design.


Signed: Hygrometre selon Saussure,

sold by

Ed. Sacre  a Bruxelles

Arched brass frame with scale of relative humidity devided into 100 degrees with the ends marked Secheresse and Humidite. The index pointer with contra weight is driven by a central double pulley. Thermometer scale calibrated into Centrigrade. Suspension ring.

This type of hygrometer was invented by Horace Benedict de Saussure (1740-1799).

Dimensions: 27 cm high and 8,5 cm wide.

France, ca 1840.


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