What is fitzroy storm glass?

The Fitzroy Storm Glass is a type of weather forecasting device that consists of a sealed glass container filled with a clear liquid and various chemical substances. It is named after Admiral Robert Fitzroy, who was the captain of the HMS Beagle during Charles Darwin's famous voyage.

The storm glass is believed to work by responding to changes in atmospheric pressure and temperature. When the liquid inside the glass crystalizes or forms crystals, it is said to indicate certain weather conditions. For example, the formation of crystals at the bottom of the glass is said to indicate fair weather, while the appearance of flakes or threads near the top may indicate stormy weather.

While the Fitzroy Storm Glass has been used as a decorative and novelty weather instrument for centuries, its accuracy and reliability as a weather forecasting tool have been widely debated. Some people believe it can be a fun and interesting way to observe changes in the weather, while others argue that it is not a scientifically valid method of forecasting.