Tonnelot Thermometer

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Description
This mercury-in-glass thermometer has a cylindrical bulb, and a milk white tube that is marked “Yale Observatory Standard No. 51 Made by Tonnelot à Paris Equal graduations Crystal glass tube made April 1879.” The scale, which extends from -4.8 to +104.6 degrees Centigrade, is graduated every degree, in fifths. The protective chrome case is marked “Yale Observatory Standard No 51.” It came to the Smithsonian from the U.S. Weather Bureau.
Ref.: Leonard Waldo, “Examination of Thermometers at the Yale Observatory,” Popular Science Monthly 18 (1881): 367-374.
Location
Currently not on view
date made
1879
maker
Tonnelot, Jules
place made
France: Île-de-France, Paris
Measurements
overall: 21 1/2 in x 11/16 in; 54.61 cm x 1.74625 cm
ID Number
PH.317451
catalog number
317451
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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