Heinrich Kayser, German physicist

Heinrich Kayser, German physicist

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Credit: EMILIO SEGRE VISUAL ARCHIVES, W.F. Meggers Collection/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Heinrich Kayser (1853-1940), German physicist, with his pet dog. Kayser worked on spectroscopy. His discoveries include the detection of helium in the Earth's atmosphere by analysing the spectrum of light from the Sun during a solar eclipse in 1868. Kayser was a professor at the University of Bonn from 1894 to 1920. He was elected a Foreign Member of the Royal Society in 1911. Kayser was nominated three times for the Nobel Prize in Physics (1905, 1916 and 1917). Photographed in Bonn, Germany, on 22 August 1938.

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