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Used to predict weather since 1750 this mysterious forecasting instrument was employed by Admiral FitzRoy of the H.M.S. Beagle when he and his lieutenant Charles Darwin voyaged to the Galapagos Islands in 1831. Although how it functions remains a mystery the ability of the storm glass to predict atmospheric change is well documented. The contained liquida mixture of distilled water potassium nitrate ammonium chloride ethanol and camphorappears cloudy when precipitation is approaching; when crystals are visible in the liquid humid or foggy weather can be expected; a cloudy glass with small stars indicates thunderstorms; a clear glass predicts calm weather. Handcrafted in the Czech Republic the borosilicate glass orb is hermetically sealed housed on a wood pedestal and secured with brass fittings. 6 1/4H x 3 1/4Diam. 1 lb. Used to predict weather since 1750 this mysterious forecasting instrument was employed by Admiral FitzRoy of the H.M.S. Beagle when he and his lieutenant Charles Darwin voyaged to the Galapagos Islands in 1831. Although how it functions remains a mystery the ability of the storm glass to predict atmospheric change is well documented. The contained liquida mixture of distilled water potassium nitrate ammonium chloride ethanol and camphorappears cloudy when precipitation is approaching; when crystals are visible in the liquid humid or foggy weather can be expected; a cloudy glass with small stars indicates thunderstorms; a clear glass predicts calm weather. Handcrafted in the Czech Republic the borosilicate glass orb is hermetically sealed housed on a wood pedestal and secured with brass fittings. 6 1/4H x 3 1/4Diam. 1 lb.