This Galileo Thermometer 34cm 5 Cognac Temperature Globes makes a wonderful focal piece within a home especially if the recipient loves the colour yellow or alternatively if a couple is celebrating a wonderful Golden Wedding Anniversary! The piece is not only for show as it also cleverly reads the temperature by the movement of the globes. Galileo Thermometer 34cm 5 Cognac Temperature Globes Further information: Contains 5 Cognac internal temperature globes with temperature reading tags. Stands at 34cm tall Tags are gold coloured & read temperatures between 18-26C. History of the galileo The physicist Galilio Galilei (1564-1642) discovered that density of liquid changes according to temperature. This principle is used within the Galileo Thermometer, Depending on the temperature, the glass bulbs in the galileo thermometer either rise or fall. The actual temperature is shown by the lowest of the upper floating glass coloured bulbs. These Traditional Galileos are finest top quality & not to be confused with cheaper imitations. Made from blown glass in Germany they really do make a perfect gift that will be admired- certainly not another dust collector. Please note that this galileo thermometer is only available for mainland UK delivery only