These high quality reproduction Barometers are replicas of the original Pressure Barometers used by mariners over the ages to indicate the fall or rise in atmospheric pressure, by which mariners could get a very good picture of what weather was in store for them during their voyges over the Oceans of the world. The are made of the finest Brass and wood.The Nautical Barometer make exciting nautical gifts and executive presents to anyone who loves the sea.