The FitzRoy Storm Glass is made of high quality glass with encapsulated liquid. This specific mixture was developed by Admiral Robert FitzRoy and used on his voyage with Charles Darwin on the HMS Beagle.
During the historic voyage, FitzRoy carefully documented how the storm glass would predict the weather:
Please note, while the Tear Drop Storm Glass looks beautiful it is not 100% reliable in delivering accurate weather forecasts.
Teardrop storm glass will either arrive with a red orblack base, colour is chosen at random.