Negretti & Zambra Maximum Thermometer

This mercury-in-glass thermometer has not yet been found in any Negretti & Zambra trade literature. A small bend in the stem is just above the cylindrical bulb. The stem has a milk-white back; the front is marked "B22580" and carries the N/Z monograms; and is graduated (but not numbered) every degree F. from -50 to +125. The thermometer is mounted on a white porcelain plate that is marked "B22580" and "NEGRETTI & ZAMBRA, LONDON" with the N/Z monogram of the firm. The plate is graduated every 5 degrees Fahrenheit from -50 to +120. This, in turn, is mounted on a wooden base with metal guards protecting the bulb, and two metal loops so that it can be hung horizontally.
Currently not on view
Object Name
maximum thermometer
date made
after 1850
Negretti & Zambra
tube: 12 in; 30.48 cm
overall: 14 in; 35.56 cm
place made
United Kingdom: England, London
ID Number
accession number
catalog number
Measuring & Mapping
Thermometers and Hygrometers
See more items in
Medicine and Science: Physical Sciences
Thermometers and Hygrometers
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
U.S. Weather Bureau

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