Gerhardt Thermometer

This mercury-in-glass thermometer has a cylindrical bulb. The milk-white back is marked “Centigrade C. Gerhardt, Bonn No. 1940.” The scale extends from -38 to +20 degrees Centigrade. The thermometer is held in a hinged, black paper case.
Carl Gerhardt began making laboratory apparatus in 1872. This thermometer may date from soon after the establishment of the Johns Hopkins University in 1876.
Currently not on view
Object Name
Gerhardt thermometer
date made
ca 1876
C. Gerhardt
overall: 6 3/4 in; 17.145 cm
place made
Deutschland: North Rhine-Westphalia, Bonn
ID Number
catalog number
accession number
Measuring & Mapping
Thermometers and Hygrometers
See more items in
Medicine and Science: Chemistry
Thermometers and Hygrometers
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Johns Hopkins University

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