Regnault Hygrometer
date: label: date made
content: 1849-1875
name: label: maker
content: Green, James
notes: label: Description
content: 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.
label: Description
content: 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.
label: Description
content: Ref: H. V. Regnault, "Études sur l'hygrométrie," <i>Annales de Chimie et de Physique</i> 15 (1845): 129-236, on 196-201.
label: Description
content: Negretti & Zambra, <i>Treatise on Meteorological Instruments</i> (London, 1864), pp. 104-105.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Thermometers and Hygrometers
label: See more items in
content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Military Academy
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.316419
label: accession number
content: 223721
label: catalog number
content: 316419
objectType: label: Object Name
content: Regnault hygrometer
physicalDescription: label: Measurements
content: 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