Negretti & Zambra Maximum Thermometer

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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
date made
after 1850
Negretti & Zambra
place made
United Kingdom: England, London
tube: 12 in; 30.48 cm
overall: 14 in; 35.56 cm
overall: 2 1/2 in x 14 in x 1 in; 6.35 cm x 35.56 cm x 2.54 cm
ID Number
accession number
catalog number
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