Toricelli (1608-1647), who proved that air pressure is subject to variations, devised the first barometer in 1643. Goethe, the famous German playwright, later developed his own simple but effective barometer using the principles established by Toricelli. The Weather Ball, based on Goethe's design, is filled with colored, distilled water.
Once filled, the air inside the ball is no longer subject to variations in atmospheric pressure. The liquid in the indicator tube, however, remains open and is directly affected by atmospheric pressure. When atmospheric pressure rises, the liquid is pushed down in the tube, indicating clear weather. When the pressure lowers, the liquid rises, indicating bad weather. Includes complete instructions.
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Product Information Specifications for Weather Ball Barometer Below:
This highly polished brass barometer can be mounted directly to the wall, on a wooden board, or on a mantle stand. Historical data indicates that fish bite on a moving barometer. In other words, when the barometric pressure is either rising or fallin...
Admiral Fitzroy (1805-1865), commander of the HMS Beagle and participant in the Darwin Expedition from 1834-1836, was a pioneer in the field of meteorology. Fitzroy used a storm glass barometer which allowed him to forecast the weather based on chang...
Large, clear dual-scale barometer in hPa (hecto Pascal) and mm (millimeter mercury) on a 4" dial which is easy to read from a distance. For classroom, lab, or industrial use. Accuracy of Â±3 to 4 hPa. Wall mounts.