The mariner's stormglass measures 4.5"H and weighs 1 lb. It has a contemporary look for Victorian technology. The stormglass has been relied on by mariners since the 1830s. It mysteriously predicts the weather up to 48 hours in advance. Crystals precipitate in unique formations based on impending weather. It includes reference card of crystal formations. Solid brass end caps forged with a brushed finish.