Thermometer in Shakespeare's England

In the year 1603, just as Shakespeare was writing Othello and the reign of Elizabeth I was transitioning to James I, Galileo Galilei—famous for exploring the heavens—was also measuring the invisible. Among his lesser-known inventions was a device called the thermoscope, an elegant glass instrument that could detect changes in temperature—centuries before the modern thermometer. Today, we call it the Galilean thermometer, named after Galileo because he discovered the principle that the density of a liquid changes in proportion to its temperature—a concept that set the foundations for modern meteorology.

To help us explore how Galileo made his discoveries, exactly how a Galilean thermometer works, and how these scientific advancements were received in Shakespeare's England, we're joined by Dr. Dario Camuffo, author of extensive research on Galileo's contributions to the measurement of temperature and the early development of thermometers.

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