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1622101394Code 6897 Aneroid barometerAneroid or holosteric brass barometer from the end of the 19th century, signed Negretti & Zambra n. I 699, complete with semicircle mercury thermometer with engraved and silver-plated brass temperature scale calibrated from 20 ° to 120 ° degrees Fahrenheit enclosed within the barometric scale. Excellent condition, fully functional. Diameter 12 cm - 4.72 inches, thickness 5.5 cm - 2.16 inches.
It’s an antique measuring instrument having an element sensitive to pressure, a metal box, named barometric capsule. The capsule contracts and dilates for changes of pressure and its movements are transmitted to an indicating pointer by a mechanical system. The inventor of this system was Bourdon, a French business man (Paris 1808-1884), that had established in Paris in 1835 a factory for make steam machines; in 1849 he invented metallic manometer, and in 1853 he invented a kind of aneroid barometer.
Enrico (Henry) Negretti (Como 1817 - London 1879), emigrated to London in 1829, where he attended the London Mechanics Institute, at the same time starting an apprenticeship in a laboratory of precision optical instruments. In 1859 he joined Joseph Zambra (1822-1897), a manufacturer of scientific instruments, and they established the Negretti & Zambra Ltd, with numerous branches in London, and soon they had a good reputation both at home and abroad because of the excellence of their products. In the early years of the company, they limited production to meteorological instruments, or, as they defined them, "philosophical instruments". About in 1857 Negretti & Zambra were commissioned by the British government to investigate about the temperature of the sea along the coasts, to clarify which influence the temperature had on migration and habits of fishes and which were the seasons and temperatures more suitable for fishing. For these investigations, the Negretti & Zambra realized for the Admiral Fitzroy a mercury thermometer that was the most accurate ever made. Towards the end of the nineteenth century, they diversified their products by manufacturing optical instruments such as astronomical and terrestrial telescopes, levels, theodolites, sights, as well as further improvements in barometers and other meteorological instruments. The company passed from father to son until 1946.
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Antique barometers
Code 6897 Aneroid barometer
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