H. J. Green Sling Psychrometer

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This instrument consists of two mercury-in-glass thermometers mounted on an aluminum frame that is marked "H. J. GREEN B'KLYN N.Y." and "No. 147 SIGNAL CORPS. U.S. ARMY" and equipped with a wooden handle. Each thermometer has a milk white back and a clear front that is graduated every degree Fahrenheit. On one the scale runs from -40 to +137; on the other, it runs from -38 to +122. This was made between 1890 (when Green moved his business to Brooklyn) and 1923 (when the instrument came to the Smithsonian).
Ref: Henry J. Green, (Brooklyn, about 1890), p.31.
Currently not on view
date made
H. J. Green
place made
United States: New York, Brooklyn
overall: 17 1/2 in x 1 in x 1 1/8 in; 44.45 cm x 2.54 cm x 2.8575 cm
ID Number
accession number
catalog number
Credit Line
U.S. Signal Corps
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Medicine and Science: Physical Sciences
Measuring & Mapping
Thermometers and Hygrometers
Data Source
National Museum of American History