Hair Hygrograph

Hair Hygrograph

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A hygrograph recordd variation in atmospheric humidity. This example is marked "JULIEN P. FRIEZ & SONS, BELFORT METEOROLOGICAL OBSERVATORY, 1230 E. BALTIMORE STREET, BALTIMORE, M.D., U.S.A." and "HYDROGRAPH, TYPE ML 16, SERIAL 74865, SIGNAL CORPS, U.S. ARMY, ORDER 110418, DATE 2/8/23." It was made between 1914 when the firm began trading under this name, and 1923, when it came to the Smithsonian. The cover is missing.
Currently not on view
Object Name
Julien P. Friez & Sons
place made
United States: Maryland, Baltimore
overall: 6 3/8 in x 12 in x 9 3/8 in; 16.1925 cm x 30.48 cm x 23.8125 cm
ID Number
catalog number
accession number
Credit Line
U.S. Signal Corps
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Thermometers and Hygrometers
Data Source
National Museum of American History
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