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Panel showing stages in Regnault dew-point construction

Regnault hygrometer

Regnault's glass measuring cylinder

1830-1876

Portable Regnault type hygrometer by Negretti & Zambra, 1931-1940

1931-1940
Regnault hygrometer with aspirator, by Elliott Bros., St Martin's Lane, London 1893.

Regnault hygrometer and aspirator, 1893

1893
Model of Regnault's original apparatus, sectioned, for measuring the co-efficient of the expansion of mercury, 1847. Made by Museum workshops, 1910.

Model of Regnault's Apparatus, 1847

1847 (original); 1910 (model)