Are fernlike crystals building up? A storm is on the way. Clear liquid? Expect clear and dry. A trusted weather predictor since the 1830s (Admiral Robert FitzRoy used one on the HMS Beagle during his voyage with Charles Darwin), the Storm Glass will tip you to what's coming 48 hours in advance. Sealed glass chamber, turned wood base. 3½"w x 5 ¾"h x 2¼"d.