A rare brass table weather forecasting calculator by Negrett...

Hammer

£70

A rare brass table weather forecasting calculator by Negretti and Zambra London, formed as 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 incorporating selections for Summer or Winter for lining up with the wind direction scale, the centre with instructions for use, sector revealing appropriate weather forecast and inscribed Negretti & Zambra, London, Patent 6276, 1915, design patented by Negretti and Zambra in 1915 using actual weather observations over a ten year period and was said to be 80% accurate by the manufacturers, 12cm diameter, excluding ring and stand, with canvas pouch, together with a Princess Mary Christmas 1914 box, a King Edward and Queen Mary bronze medal, boxed and a volume of Good Intentions by Ogden Nash.