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Barometer Internals

  
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Barometers > Barometer Styles • Barometer Internals Photograph

 
internal workings of a weather barometer
Barometers are a useful tool for weather prediction, and they come in many sizes and styles, from simple to elaborate.  This gold barometer clearly shows the internal spring mechanism which moves its gauge in response to changing air pressure.
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Barometer Internals Picture