E.S. Sorensen Stormglass Weather Change Predictor (Brass) Stormglass weather change predictor for anticipating storms Modeled after stormglass instruments used in the 18th and 19th centuries Storms' electromagnetic fields create series of crystal structures in glass Enclosed in sealed glass chamber within beautifully crafted brass cylinder Measures 6.5 inches tall and 1.25 inches in diameter; weighs 11 ounces