I was given this Storm Glass for my 76th birthday last month, and to be honest , I am not too sure what to make of it?

This storm glass came into use in the early 1700's when sailors attached it to the mast of their ships.

How is works remains a mystery, but it is believed that electromagnetic changes associated with weather patterns activate the crystals.

These changes produce different patterns in the crystals inside glass tube that can be interpreted to forecast weather conditions at sea.

Has anyone else ever heard of the Fitzroy Star Glass or have any idea if it actually works - or is it just a piece of "nautical nonsense" ?

Bob