In the middle of the 17th Century Italian physicist and mathematician Evangelista Torricelli (1608-47) accidentally invented one of the major contributions to scientific measurement and method. What was this?

Answer: In 1643, while working on a water pump for the Duke of Tuscany using mercury, he realized that the rising and falling of the mercury sealed in a container was due to atmospheric pressure, and thereby invented the mercury barometer.

Source: History Year by Year published by Dorling Kindersley

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