Hair Hygrometer

Hair Hygrometer

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Description
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.”
Location
Currently not on view
Object Name
hygrometer
date made
after 1908
maker
H. J. Green
place made
United States: New York, Brooklyn
Measurements
overall: 7 3/4 in x 6 in; 19.685 cm x 15.24 cm
ID Number
PH.314528
catalog number
314528
accession number
204612
Credit Line
United States Weather Bureau
subject
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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