Negretti & Zambra Pocket Barometer
Negretti & Zambra Pocket Barometer. An uncased Negretti & Zambra compensated pocket barometer. Numbered 20842. Approximately 50mm diameter and 15mm deep. Pressure test indicates that its in full working order.
Negretti and Zambra (active 1850 – c. 1999) was a company that produced scientific and optical instruments and also operated a photographic studio based in London.
Henry Negretti (1818–1879) and Joseph Zambra (1822–1897) formed a partnership in 1850, thereby founding the firm which would eventually be appointed opticians and scientific instrument makers to Her Majesty Queen Victoria, Prince Albert and King Edward VII, the Royal Observatory and the British Admiralty. Henry (Enrico Angelo Lodovico) Negretti was born in Como, Italy. Joseph Warren Zambra was born in Saffron Walden, Essex the son of Joseph Cezare Zambra and Phyllis Warren.