www.antik.it/Antique-barometers/61051-Weather-forecast/
1533132436Code 61051 Weather forecastDesk tool made by Negretti & Zambra to forecast the weather; it was made in 1915 circa and, in addition to the manufacturer's signature, you read Barometer readings reduced to sea level, patent 6276/15. Brass, excellent condition, measures 8.5x5.7x14.7 cm - 3.34x2.24x5.78 inches.
The instrument was used in conjunction with a barometer (with the same scale as the instrument, from 28 to 31 inches); first of all by means of a lever on the right side of the instrument the wind direction had to be selected, then turning a wheel placed at the center of the instrument it was necessary to move its indicator on the value marked by the barometer; this central disk had small windows from which it was possible to read letters, which indicated the weather forecast at dawn and at sunset and steady; according to the visible letters, by turning a wheel on the right side of the instrument, you could read the corresponding weather forecast in the lower window on the front of the instrument. For example, if at dawn through the pointer window I could read UV, the prediction was U: Rain at times; V: rain at times becoming very unsettled.
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.
5/5
MICHAEL - CA USA 03/28/2019
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Antique barometers
Code 61051 Weather forecast
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