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23.1 x 32.3 cm ⏐ 9.1 x 12.7 in (300dpi)
ANN RONAN PICTURE LIBRARY / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY ANN RONAN PICTURE LIBRARY / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY
Jean Bernard Leon Foucault (1819-1860), French physicist. Foucault measured the velocity of light and, in 1851, proved the rotation of the Earth on its axis using his pendulum. He invented the gyroscope (1857), and improved the design of the reflecting telescope.
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