The Galileo Thermometer

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Image Credit Flickr User Tadek

Galileo Galilei was an Italian jack of all arts and science trades who played a major role in the Scientific Revolution of the seventeenth century. His discoveries about the effect of temperature on the density of liquids led to a thermometer being named after him.The instrument consists of a sealed glass cylinder containing a clear liquid and a series of bulbs with weights attached.  As the temperature changes, the bulbs rise and fall depending of a number of mathematical principles first conceived by Galileo. It is not only functional; it is also very beautiful.

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I gave my husband one of these a few years ago kind of as a last-minute gift because I was running out of ideas. Turned out he'd always wanted one and he loved it. Ours has different colored liquid in each of the floats and is jewellike and lovely.
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I had one for a long time which fell and broke just recently. The fluid holding all the glass balls is oily and really hard to clean up -.-.

@Ron R : There is no gas inside the bulbs. I think the bulbs just have water in them and the clear liquid is similar to oil. I read about it but it's sort of difficult to understand for non-chemists like me. There is something to do with the weight of the metal tabs on the bulbs too.
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