DIY: Galileo Thermometer

Galileo Thermometer
Here is an interesting guide on how to build your own Galileo Thermometer:
http://www.metlink.org/pdf/teenagers/experiments/galileo.pdf. I have not tested it yet, but it sounds promising 😉
(Picture: By Hustvedt (Own work) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)%5D, via Wikimedia Commons)