The Weems Storm glass Set is a mysterious weather predictor that is sure tointrigue. Storm glass instruments have been in use since the 1750s. AdmiralFitzroy the famous sailor and meteorologist mounted an instrument similar tothe storm glass on the mast of HMS Beagle as a storm warning instrument duringhis historic voyage with Darwin in the 1830s. The premise of the Weems Stormglass is that changing weather affects the solubility of the mixture ofchemicals in the sealed glass tube. Some believe that the changes in crystalstructures have to do with the electromagnetic changes caused by weather andsun storms. Highlights: Beautifully crafted chrome cylinder displayed on woodfreestanding or wall mounted presentation plaque with marine lacquer Sealedglass chamber holds the crystals of the storm glass Chrome & black platedisplays a key detailing crystal formations plus the storm glass historyInstructions & mounting hardware Lifetime guarantee.