antik.it/Antique-barometers/7963-Aneroid-Barometer/
Code 7963
EUR 750.00
In stock
1720887792Code 7963 Aneroid BarometerAneroid or holosteric brass barometer, table and wall, from the end of the 19th century, signed Negretti & Zambra London I 2402.
In good condition, in perfect working order.
Diameter 12 cm – 4.5 in, thickness 5.7 cm -2.35 in.
It is an ancient measuring instrument whose pressure-sensitive organ is a metal box called a barometric capsule. The capsule contracts or expands as a result of changes in pressure and its movements are transmitted to an indicator hand via a mechanical system. The development of this type of barometer is due to Bourdon, a French inventor and industrialist (Paris 1808-1884), who had founded a factory in Paris in 1835 for the construction of steam engines; in 1849 he invented the metallic manometer, to which he linked his name, and in 1853 a type of aneroid barometer.
Enrico (Henry) Negretti, born in Como in 1817 and died in London in 1879, emigrated to London in 1829, where he attended the London Mechanics Institute, simultaneously starting an apprenticeship in a precision optical instrument laboratory. In 1859 he partnered with Joseph Zambra (1822-1897), also a maker of scientific instruments, and they founded Negretti & Zambra Ltd, with numerous offices in London, and soon established a good reputation both at home and abroad for the excellence of their products. In the first years of the company's activity they limited their production to meteorological instruments, or, as they called them, to "philosophical instruments". Around 1857 they were commissioned by the British government to carry out investigations into the sea temperature on their coasts, to clarify what influence the temperature had on the habits and migrations of fish and which seasons and temperatures were most suitable for fishing. For these investigations, Negretti & Zambra developed a mercury thermometer for Admiral Fitzroy which proved to be the most precise ever made until then. Towards the end of the 19th century they diversified their type of products by manufacturing optical instruments such as terrestrial and astronomical telescopes, levels, theodolites, viewfinders, as well as making further improvements to barometers and other meteorological instruments. The company passed from father to son until 1946.
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Italy: delivering on the average in 24 h.
Europe: delivering on the average in 2/3 weekdays.
Other countries: delivering on the average in 5 weekdays; custom duties charged to the buyer.
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Antique barometers
Code 7963 Aneroid Barometer
Antik Arte & Scienza sas di Daniela Giorgi - via S. Giovanni sul Muro 10 20121 Milan (MI) Italy - +39 0286461448 - info@antik.it - www.antik.it - Monday-Saturday: 10am-7pm
