Eudiometer (Replica)

In the 1770s, scientists developed eudiometers for determining the goodness (or rather, the oxygen content) content of samples of air. The most successful form, described by Alessandro Volta in 1777, used an electric spark to ignite the air to be tested.
This is a further development of Volta’s instrument. Its inventor, the American chemist, Robert Hare (1781–1858), termed it an “aqueous sliding-rod hydro-oxygen eudiometer.” This replica of Hare’s instrument was made in anticipation of the opening of the National Museum of History and Technology in 1964.
Ref: Robert Hare, “An Account of Some Eudiometers of an Improved Construction,” The Philosophical Magazine and Journal 67 (1826): 21–30.
Currently not on view
Object Name
eudiometer, replica
date made
Hare, Robert
Eichner, Laurits Christian
Physical Description
copper (overall material)
glass (overall material)
overall: 7 1/2 in x 1 1/2 in x 21 1/2 in; 19.05 cm x 3.81 cm x 54.61 cm
tube and piston: 20 in; 50.8 cm
bulb: 3 1/4 in; 8.255 cm
ID Number
catalog number
accession number
Science & Mathematics
See more items in
Medicine and Science: Chemistry
Data Source
National Museum of American History, Kenneth E. Behring Center
Additional Media

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