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The Barometer. Evangelista Torricelli became the first scientist to create a sustained vacuum and to discover the principle of a barometer. Torricelli realized that the variation of the height of the mercury from day to day was caused by changes in the atmospheric pressure.
Torricelli was a significant influence on the early scientific revolution; had he lived longer, or published more, he would surely have become one of the greatest mathematicians of his era. Top John Brehaut Wallis (1616-1703) England