Stick mounted Fortin-type standard barometer with thermometer also attached to the tube by brass and steel fittings. At foot of the glass tube a black painted steel casing protects the mercury reservoir (now empty). The whole instrument is mounted on a mahogany blackboard with special wooden supports to further protect the reservoir.
Detailed dimensions:
Overall height: 115 cm
Glass tube length: 88 cm
Thermometer: 18 cm
Scale: 28 cm
[Top] No. 2222
[label on backboard] NEGRETTI and ZAMBRA / Inst. Makers / to Her Majesty / London
[metal label around tube:] 2222 / STANDARD / CONDITION / TEMPERATURE 0˚C / {etc.}
Formerly used at the Royal Observatory Greenwich (Meteorological Department) and Royal Observatory Edinburgh before returning to the National Maritime Museum in 1984.
For more details about this type of instrument, see ‘A Treatise on Meteorological Instruments, Explanatory of Their Scientific Principles, Method of Construction, and Practical Utility’, Henry Negretti and Joseph Zambra, Chapter 1, section 4, pp.4-5 (1864).

Object Details

ID: NAV0808
Collection: Astronomical and navigational instruments
Type: Barometer
Display location: Not on display
Creator: Negretti & Zambra
Date made: circa 1870
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall: 940 mm; Diameter: 70 mm
Parts: 2222

Your Request

If an item is shown as “offsite”, please allow eight days for your order to be processed. For further information, please contact Archive staff:

Tel: (during Library opening hours)

Click “Continue” below to continue processing your order with the Library team.