Regnault's glass measuring cylinder
1830-1876
Regnault hygrometer
1893
Panel showing stages in Regnault dew-point construction
Portable Regnault type hygrometer by Negretti & Zambra, 1931-1940
1931-1940
Model of Regnault's Apparatus, 1847
1847 (original); 1910 (model)
Regnault hygrometer and aspirator, 1893
1893