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Termometro a ranocchietta
Thermometer in the shape of a frog

1642-1667
Glass; length 6,5 cm
Replica (Martino Luciano & C., 2001)
Florence, Istituto e Museo di Storia della Scienza, inv. 3618

This thermometer, also called a "small toad", contained small glass spheres of different density immersed in alcohol. It was used as a clinical thermometer.