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American Museum of Natural History.

Wood Encased Galileo Thermometer

$35.55 Member Price

These thermometer have various spheres and is named after Galileo Galilei because he discovered the principle on which this thermometer is based—that the density of a liquid changes in proportion to its temperature—and invented a thermoscope based on this principle.

Do not place in direct sunlight. 
Size: 12" has five spheres.