LOT 80 AN IVORINE FRONTED DESK WEATHER FORECASTING CALCULATOR
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AN IVORINE FRONTED DESK WEATHER FORECASTING CALCULATORNEGRETTI AND ZAMBRA, LONDON, EARLY 20th CENTURYThe gabled plate with central circular scale incorporating adjtments 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 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; together with an IVORINE POCKET WEATHER FORECASTING CALCULATOR, also by Negretti and Zambra incorporating the same functions into a small triple-layer disc radially inscribed with forecast key to rear, (2).The desk calculator 14.2cm (5.625ins) high, 7.5cm (3ins) wide, 5.5cm (2.25ins) deep; the pocket calculator 5.5cm (2.25ins) diameter.Provenance: The exhibition collection of Barometer World Meum, Merton, Devon.The calculators in the current lot are based upon Negretti and Zambra's design of forecasting calculator patented in 1915, which was developed ing actual weather conditions over a ten year period. By setting the wind direction and lining up the central disc for the current barometer reading for each, 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 for the desk calculator or against the inscribed radial to the rear of the pocket version.
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