A thermoscope is a device that shows changes in temperature. A typical design is a tube in which a liquid rises and falls as the temperature changes. The modern thermometer gradually evolved from it with the addition of a scale in the early 17th century and standardisation throughout the 17th and 18th centuries.
Galileo thermoscope, The Musée des Arts et Métiers, Paris
Galileo di Vincenzo Bonaiuti de' Galilei, commonly referred to as Galileo Galilei or simply Galileo, was an Italian astronomer, physicist and engineer, sometimes described as a polymath. He was born in the city of Pisa, then part of the Duchy of Florence. Galileo has been called the father of observational astronomy, modern-era classical physics, the scientific method, and modern science.
1636 portrait
Portrait believed to be of Galileo's elder daughter Virginia, who was particularly devoted to her father.
Galileo's "cannocchiali" telescopes at the Museo Galileo, Florence
An illustration of the Moon from Sidereus Nuncius, published in Venice, 1610