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.
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

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Enter the characters shown in the image.