During this article on how to repair a barometer you'll learn about best practices when trying to repair a barometer. Depending on the type of barometer certain repairs can be done but the amount of work you can put in is somewhat limited by the fact that a barometer doesn't have too many parts which can be patched. Given the fact that a barometer is usually made out of a tube filled with a liquid (or is aneroid - no liquid) the only parts that could be replaced are the casing and a few of the reading mechanism's parts. The actual reading and display mechanism is pretty much like a watch and has the inside made out of cog wheels and requires skill to repair those. Getting to repair a barometer is something that's best left to the pro's as it's pretty much grunt work and can be sometimes dangerous for your health. In the case of mercury barometers (most household barometers are based on mercury) exposure to the mercury presents certain health risks that I don't really think are worth taking. Unfortunately things aren't as easy as they might seem because barometer repair shops are somewhat rare because of the fact there aren't many barometer owners and there are even fewer that are willing to pay for such a repair. Another negative aspect of getting to repair a barometer is the fact that it costs a pretty penny and not many are willing to spend that much on an antique ...
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