Evaporimeter

Description
Albert Piche, in Paris, described this simple instrument in 1872, and the Signal Service was soon using evaporimeters to determine the rate of evaporation in different parts of the United States. An account from 1888 mentions "an inverted graduated test-tube filled with water, its mouth closed by a disk of filter paper held by a spring." In this example, the evaporimeter (probably an improved version designed by Charles F. Marvin of the U.S. Weather Bureau) is enclosed in a copper box on iron legs.
An evaporimeter is also known as an atmometer.
Ref.: "Exhibition of the New England Meteorological Society," American Meteorological Journal 5 (1888): 443.
"Improved Piche Evaporimeter," in H. J. Green, Scientific Instruments. Catalog C (Brooklyn, n.d.), p.15.
Location
Currently not on view
Measurements
overall: 16 7/8 in x 9 1/4 in x 9 1/8 in; 42.8625 cm x 23.495 cm x 23.1775 cm
ID Number
PH.316818
catalog number
316818
accession number
228768
Credit Line
U.S. Weather Bureau
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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