Hydrometer

Hydrometer

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Description
Glass hydrometer with mercury ballast, and paper label marked “Pat. Appl'd For PER CENT OF PROOF SPIRITS TP. 60° F. AMERICAN INSTRUMENT CO. WASHINGTON, D.C.” and in red ink “2631” and “1935.”
Ref: George K. Porter, “Hydrometer,” U.S. Patent 2,195,339 (March 26, 1940), assigned to American Instrument Co.
Location
Currently not on view
Object Name
hydrometer
maker
American Instrument Company
place made
United States: District of Columbia, Washington
Measurements
overall: 10 in x 1 in; 25.4 cm x 2.54 cm
overall: 10 in x 1 1/8 in; 25.4 cm x 2.8575 cm
ID Number
PH.327005
catalog number
327005
accession number
267815
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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