- Henri Victor Regnault, professor of physics at the College de France in Paris, described this type of instrument in 1845. It consists of a brass stand; a silver tube into which ether is poured and through which air can be made to pass; a thermometer to take the temperature of the ether; and another to measure the ambient air.
- This example has two mercury-in-glass thermometers, each of which has a milk-white back marked "Jas. Green. 175 Grand St. New York." The clear front of one is graduated every ½ degree Fahrenheit from -15 to +130. The clear front of the other is graduated every degree Fahrenheit from -10 to +120. It was made between 1849 and 1875 when James Green was working at this address in New York City. It came to the Smithsonian from the U.S. Military Academy.
- Ref: H. V. Regnault, "Études sur l'hygrométrie," Annales de Chimie et de Physique 15 (1845): 129-236, on 196-201.
- Negretti & Zambra, Treatise on Meteorological Instruments (London, 1864), pp. 104-105.
- Currently not on view
- Object Name
- Regnault hygrometer
- date made
- James Green
- place made
- United States: New York
- overall in box: 2 in x 13 3/4 in x 4 1/2 in; 5.08 cm x 34.925 cm x 11.43 cm
- ID Number
- accession number
- catalog number
- Credit Line
- U.S. Military Academy
- See more items in
- Medicine and Science: Physical Sciences
- Measuring & Mapping
- Thermometers and Hygrometers
- Data Source
- National Museum of American History
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