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• JAWA telescopes:
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Travel Compass:
a reliable companion for hiking or star gazing.

A free gift for every order over $200.

A colorful glass ball rises in a glass cylinder to tell you the temperature of the room. Magic? This hand crafted instrument is also an exquisite piece of art. Each thermometer consists of a glass cylinder filled with clear liquid and a number of glass balls filled with colored liquid. The temperature is given by the number on the lowest glass ball floating.

The Galileo thermometer dates back to the 16th century. It works on the phenomenum observed first by Galileo (hence the name) that the density of liquids changes with temperature. The density of the clear liquid increases considerably as the temeprature decreases. Because the glass balls expands and shrinks so little, the volume of each glass ball can be considered constant. At each temperature, only the glass ball denser than the liquid falls down to the bottom: the lowest one floating marks the approximate temperature.

(out of stock)