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Galileo Thermometer

This beautiful thermometer springs from the discovery by the 17th century scientist Galileo Galilei that the density of liquids varies with temperature. It was invented almost 400 years ago by students of Galileo.

Carefully weighted glass globes are suspended in a liquid-filled tube, where they sedately sink or float as the surrounding air gets hotter or colder. Temperature is indicated by the engraved brass tag on the lowest floating globe.

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Glass, 18-26 degree Celsius temperature range
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