Our distinctive ornamental (but functional) thermometers utilise 17th century astronomer Galileo Galilei's discovery that the density of liquids varies with temperature. 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. 11 globe models are 24" tall, seven globe models are 17" tall, five globe models are 13 " tall and Piccolo models (five globes) are 11" tall. Temperature is shown in Celsius.