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17 INCH GALILEO THERMOMETER The thermometer is made up of a glass cylinder filled with a special liquid. Inside the cylinder are 8 liquid-filled, hand blown, glass spheres each with imprinted designated temperature reading medallions. Italian astronomer and physicist, Galileo Galilei’s discovery that the density of liquid expands or contracts with temperature changes led to the creation of this famous thermometer — a fascinating method of searching for exact temperature measurements. As temperatures fall, spheres will rise, as temperatures rise, spheres will sink. The lowest floating sphere will indicate actual temperature. What a great functional desk accessory and conversation piece for the person who has everything!