£80
A brass table weather-forecasting calculator by Negretti & Zambra, consisting of three discs, the outer calibrated in inches for the barometer reading to the top edge and for wind direction to the lower edge, the middle ring is inscribed Steady, Rising and Falling and for Summer or Winter, for lining up with the wind direction scale, the centre with instructions for use, section revealing appropriate weather forecast and inscribed Negretti & Zambra, London, Patent 6276, 1915, with hinged strut to back, 12cm diameter, together with a Negretti & Zambra pocket forecaster, (2).
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