Hair Hygrometer

Hair Hygrometer

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Charles F. Marvin, a meteorologist who spent his career with the Army Signal Corps and its successor, the U.S. Weather Bureau, introduced this type of hygrometer in 1908. Unlike the original described by Horace Benedict de Saussure, of Geneva, in 1783, the Marvin instrument had two bundles of hair. The inscription on this example reads “PERCENTAGE OF SATURATION / (RELATIVE HUMIDITY) / HAIR HYGROMETER / No. 19 / U.S. WEATHER BUREAU / HENRY J. GREEN / B’KLYN, N.Y.”
Currently not on view
Object Name
date made
after 1908
H. J. Green
place made
United States: New York, Brooklyn
overall: 7 3/4 in x 6 in; 19.685 cm x 15.24 cm
ID Number
catalog number
accession number
Credit Line
United States Weather Bureau
U.S. Weather Bureau
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Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History
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