Ernest Ruska, German physicist

Ernest Ruska, German physicist

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Credit: EMILIO SEGRE VISUAL ARCHIVE/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Ernest Ruska (1906-1988), German physicist. Ruska was born in Heidelberg, Germany, on 25 December 1906 and was educated in Munich and Berlin. In 1931, he used a magnetic coil to focus an electron beam, which began his development of the first electron microscope. By 1933, he had developed an electron microscope with a magnification of x12,000, far higher than a light microscope. In 1957, Ruska became Director of the Institute for Electron Microscopy, a post he held until his retirement in 1974. Photographed in 1986, the year that Ruska received the Nobel Prize for Physics.

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