H. J. Green Hygrograph

A hygrograph records the fluctuations of the relative humidity over some period of time. This example is marked "HENRY J. GREEN B'KLYN, N.Y. No.1039 TYPE 615 U.S.W.B. No.67" In place of the usual hair element, it has a sheet of goldbeater's skin held by two aluminum rings.
This was made after 1890 when Green moved to Brooklyn and the U.S. Weather Bureau was established.
Currently on loan
Object Name
date made
after 1890
H. J. Green
place made
United States: New York, Brooklyn
ID Number
catalog number
accession 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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