Tonnelot Thermometer

Description
This mercury-in-glass thermometer has a cylindrical bulb. The tube is marked, in red, “Tonnelot à Paris (1884.5) 4289” and graduated from -10.2 to 108.0 degrees (Centigrade?). It is probably one of the very precise thermometers with a tube of extra-hard glass that was made by Tonnelot for the International Committee of Weights and Measures, tested at the Bureau International at Sèvres, and distributed to government organizations around the world. It came to the Smithsonian from the U.S. Weather Bureau.
Ref: J. A. Hall, “The International Temperature Scale Between 0 Degrees and 100 Degrees C,” Philosophical Transactions 229 (1930): 1-48.
Location
Currently not on view
date made
ca 1884
maker
Tonnelot, Jules
place made
France: Île-de-France, Paris
Measurements
overall: 25 1/2 in; 64.77 cm
ID Number
PH*317449
catalog number
317449
accession number
230396
Credit Line
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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