H. J. Green Hygrograph

Description
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.
Location
Currently on loan
Object Name
hygrograph
date made
after 1890
maker
H. J. Green
place made
United States: New York, Brooklyn
ID Number
PH*317486
catalog number
317486
accession number
230396
subject
U.S. Weather Bureau
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Thermometers and Hygrometers
Data Source
National Museum of American History, Kenneth E. Behring Center

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