Goethe barometer forest glass

This jar indicates changes in the weather by the fact that when the air pressure rises, the water level in the beak drops (and vice versa). Goethe owned one; it can be seen in the house on the Frauenplan in Weimar and is still in working order after 200 years. Contrary to some legends, however, the Privy Councillor did not develop it - its origins are to be found in the Netherlands at the beginning of the 17th century. Our version is made of the famous Thuringian Forest glass, which owes its naturally gradient green tones to the high proportion of iron oxides in the sands of the Thuringian Forest. Also characteristic are the so-called "Gispen" in the glass, enclosed air bubbles, which are a sign of the traditional processing method. The barometer is operated with boiled or distilled water, which you can also color for better visibility - for example, with commercially available coloring tablets for Easter eggs.