This Galileo Thermometer 43cm 7 Black Temperature Globes not only makes a fabulous ornamental piece to have on display within the home but it also reads the temperature by the movement of the globes. The piece also has all plain black globes which will suit all tastes & decor. Galileo Thermometer 43cm 7 Black Temperature Globes Further information: Contains 7 Black internal temperature globes with temperature reading tags. Stands at 43cm tall Tags are gold coloured & read temperatures between 16-28C. 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 item is only available for mainland UK delivery within our standard delivery option, for NI/ Offshore & some highlands further charges will be incurred of which you will be contacted after the order has been placed. This item is not available for international delivery.