My brother's Five Bubble Galileo Thermometer. This thermometer works by the air temperature changing the density of the clear liquid in the tube. This liquid isn't water, but an inert hydrocarbon. The density then varies depending on the air. This causes the bubbles to rise or fall. As can be seen in the picture, the temperature is about 70º (Another bubble, not shown, is 68º). To learn more, look here: Galileo Thermometer Wiki
DateTime digitized: 2008:03:13 13:53:50
Exposure Program: Aperature Priority
Exposure Time: 1/100 sec
FNumber: f 4.5
Focal length: 33 mm
ISO: 1600
Model: Canon EOS DIGITAL REBEL XT
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