Charles Guillaume, Swiss physicist

Charles Guillaume, Swiss physicist

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

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Caption: Charles Edouard Guillaume (1861-1938), Swiss physicist. Guillaume studied at the ETH Zurich, in Switzerland, and then went to work at the International Bureau of Weights and Measures, which had been founded in 1875. He started work there in 1883 and eventually rose to become the Bureau's Director from 1915 until his retirement in 1936. During his career, Guillaume made many observations related to measurement, including thermometry, weights, and standard units. It was his discovery of nickel-iron alloys (such as invar and elinvar), and their application in precision instruments, that led to him being awarded the 1920 Nobel Prize in Physics.Restrictions:

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