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Choose from large (11″), mini (6″), or Teardrop
An amazing learning tool in your classroom and an incredible addition to your Science Cave!
The Storm Glass was used by Admiral FitzRoy on his historic voyage with Charles Darwin from 1834-1836, where he was commander of the HMS Beagle. FitzRoy, who engaged in some pioneering work in meteorology, used the Storm Glass for weather forecasting.
Ambient temperature affects the liquid’s solubility, resulting in crystal formation. The formation of crystals (or lack thereof) are used to interpret the weather. The rate of temperature change also affects the crystal growth, so the storm glass crystals retain a recent history of temperature changes. If there are large flakes throughout the liquid, it will be overcast in temperate seasons or snowy in the winter. Threads near the top indicate that it will be warming or windy. Crystals at the bottom indicate frost. A cloudy glass with small “stars” indicates thunderstorms. If the liquid in the glass is clear, the weather will be bright and clear. Instructions for interpreting the crystal patterns are included.
