Object Details
- Description
- Alcohol-in-glass Rutherford-type thermometer mounted on a white porcelain plate marked "NEGRETTI & ZAMBRA, SCIENTIFIC INST. MAKERS, LONDON" with the N/Z monogram of the firm, and "24" with the M/O monogram of the British Meteorological Office. This plate is graduated every 5 degrees Fahrenheit from -20 to +110. The stem is marked "24" and with the N/Z and M/O monograms; and is graduated (but not numbered) every degree F. from -21 to +112. The whole is mounted on a wooden base with metal guards for the bulb. There are also two metal loops so that it can be hung horizontally.
- Negretti & Zambra claimed that they were "the first to introduce into extensive use thermometer and barometer scale-plates made of porcelain, having the divisions and figures engraved thereon by means of fluoric acid, and permanently burnt-in and blackened so as always to present a clear legible scale" that would not be affected by sea water or by atmospheric conditions.
- Ref.: Negretti & Zambra, A Treatise on Meteorological Instruments (London, 1864), pp. 65 and 76.
- Location
- Currently not on view
- Data Source
- National Museum of American History
- maker
- Negretti & Zambra
- date made
- after 1850
- Credit Line
- U.S. Weather Bureau
- Measurements
- overall: 11 11/32 in; 28.829 cm
- overall: 3 1/4 in x 13 5/8 in x 1 5/16 in; 8.255 cm x 34.6075 cm x 3.33375 cm
- Object Name
- thermometer
