Torricelli, Evangelista (āvänjālēˈstä tōr-rēchĕlˈlē) [key], 1608–47, Italian physicist and mathematician. He was Galileo's secretary (1641–42) and his successor as professor of philosophy and mathematics at Florence. He invented the barometer (1643), called the Torricelli tube, and a microscope, and he improved the telescope.
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