This is a Vintage Beaufort Handheld Cup Anemometer that was salvaged off of a once working vessel.
As the wind blows, the cups rotate, making the rod spin. The stronger the wind blows, the faster the rod spins. The anemometer counts the number of rotations, or turns, which is used to calculate wind speed. If the wind speed shows a 0 then the winds are calm but if it gets to a 5 or higher the waves are getting stronger and more serious!
This cup anemometer comes inside of a wooden box that has a strap on the outside. It is all black and has three cups connected to it.
This Vintage Beaufort Handheld Cup Anemometer would be a great item to add to your nautical collection!