H. J. Green Psychrometer

This instrument consists of two mercury-in-glass thermometers mounted on a wooden board. Each thermometer is on a molded aluminum plate marked H. J. GREEN B’KLYN. N.Y.” and “U.S. WEATHER BUREAU.” One is also marked “No. 4860” and the other is marked “No. 5097.” The brass support for the latter is marked “J. P. FRIEZ BALT. MD.”
The dry bulb thermometer has a milk-white back marked “No. 4860 U.S. WEATHER BUREAU.” Its front is clear and graduated every degree Fahrenheit from -38 to +134. The wet bulb thermometer has a milk-white back marked “No. 5097 U.S. WEATHER BUREAU.” Its front is clear and graduated every degree F from -30 to +112. The water cistern is missing. This instrument was made between 1890, when Green moved his business to Brooklyn, and 1954, when it came to the Smithsonian.
Ref.: Henry J. Green, (Brooklyn, 1900), p. 26.
Currently not on view
Object Name
H. J. Green
place made
United States: New York, Brooklyn
ID Number
accession number
catalog number
Measuring & Mapping
U.S. Weather Bureau
Thermometers and Hygrometers
See more items in
Medicine and Science: Physical Sciences
Thermometers and Hygrometers
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
U.S. Weather Bureau

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