User manual CHANEY INSTRUMENT MODEL 00795 GALILEO THERMOMETER WITH BAROMETER BALL

[. . . ] Historic "Storm Glass" Barometer History The Storm Glass, or Goethe Barometer, is regarded as the oldest barometer in the world. Although Johan Wolfgang von Goethe is sometimes credited with its invention, one was found in his bedroom after his death, there is evidence that the Moors used similar instruments during the 8th century. [. . . ] 6) Hold the Storm Glass with one hand while holding the syringe with the other. Turn the Storm Glass upside down. 7) Slowly inject the colored water into the chamber of the Storm Glass until it is about half full. 9) Turn the Storm Glass back to its upright position and set it on a flat surface The water should be about 1" up the spout of the Storm Glass. If the water is not at this level, fill the syringe with air and insert the filling tube back into the top of the water chamber. You may want to do this over a sink and have a cloth or per towels handy for clean up. Once you remove the injection tube the water should be further up the spout. Once filled the water in the spout will immediately respond to changes in barometric pressure. Some evaporation may occur over time and additional water can be added as necessary. Reading the Instrument Variations in barometric pressure are associated with weather systems and these changes are immediately shown by the level of the water in the spout. A low water level in the spout indicates "High Pressure" and fair weather can be expected. A high water level in associated with "Low Pressure" and forecasts poor weather conditions. [. . . ] The Storm Glass does not indicate exact barometric pressure, as would a numeric barometer, but it is an accurate monitor of changes in air pressure. It is accurate enough to display the change in air pressure between the basement and attic of the same house. [. . . ]