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Home > Auction >  欧洲精美钟表、气压计及科学仪器 >  Lot.25 A BRASS DESK WEATHER FORECASTING CALCULATOR

LOT 25 A BRASS DESK WEATHER FORECASTING CALCULATOR

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GBP250
Estimate  GBP  250 ~ 350

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Dreweatts 1759

欧洲精美钟表、气压计及科学仪器

Dreweatts 1759

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A BRASS DESK WEATHER FORECASTING CALCULATORNEGRETTI AND ZAMBRA, LONDON, EARLY 20th CENTURYThe gabled plate with central circular silvered scale incorporating adjustments for DIRECTIONS OF WIND and barometric pressure reading providing a response in the form of letter key within a choice of three slots on the centre panel depending on whether barometric pressure is FALLING, STEADY or RISING, the upper edge of the plate labelled BAROMETER READINGS, REDUCED TO SEA LEVEL and the lower section with slot to reveal the forecast for each corresponding letter key brought into view by turning a knurled knob to the right hand side, the lower margin signed NEGRETTI & ZAMBRA, LONDON.14.2cm (5.625ins) high, 7.5cm (3ins) wide, 5.5cm (2.25ins) deep. The current lot is based upon Negretti and Zambra's design of forecasting calculator patented in 1915, which was developed using actual weather conditions over a ten year period. By setting the wind direction and lining up the central disc for the current barometer reading, a key in the form of a letter appearing within the appropriate aperture in the centre of the disc (which takes into account whether the pressure has been rising, falling or remaining steady) can be obtained. This key can then be translated into a 'forecast' by lining up the letter in the slot below.

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Donnington Priory Oxford Road Donnington Newbury Berkshire RG14 2JE

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