Winlock and Huddleston Psychrometer
name: label: maker
content: Huddleston, John S. F.
label: maker
content: Winlock, Joseph
notes: label: Description
content: Joseph Winlock, a professor of astronomy at Harvard, and John S. F. Huddleston, a thermometer and barometer maker in Boston, designed this instrument to provide "a simple, efficient, and convenient means of determining the relative humidity of the atmosphere or the dew-point, so called, without calculation."
label: Description
content: In this example, the dry bulb thermometer is mounted on a plate that is marked "HYGROPHANT" and "PATENTED MARCH 31, 1874" and and "805" and graduated every degree Fahrenheit from -30 to +125. The wet bulb thermometer is mounted on a plate that is marked "HUDDLESTON BOSTON" and graduated every degree Fahrenheit from -10 to +125. Between the two is a rotating chart that indicates relative humidity, as well as a plate graduated every degree from 0 to +110.
label: Description
content: Ref: J. Winlock and J. S. F. Huddleston, "Psychrometer," U.S. Patent 149,176 (March 31, 1874).
label: Location
content: Currently not on view
place: label: place made
content: United States: Massachusetts, Boston
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Thermometers and Hygrometers
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content: Measuring & Mapping
creditLine: label: Credit Line
content: Smithsonian Astrophysical Observatory
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.314864
label: catalog number
content: 314864
label: accession number
content: 211531
objectType: label: Object Name
content: hygrometer
physicalDescription: label: Measurements
content: overall: 12 1/2 in x 5 in x 2 1/2 in; 31.75 cm x 12.7 cm x 6.35 cm