Charles Édouard Guillaume was a prominent French physicist known for his significant contributions to the field of metrology, particularly in the study of physical constants and the development of precision measuring instruments. He was born on February 15, 1861, and passed away on June 13, 1938. Guillaume is particularly renowned for his work on the determination of temperature scales and the alloy known as Invar, which has a very low coefficient of thermal expansion.
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A physicist.[ref]
https://library.ethz.ch/en/collections-and-archives/short-portraits/guillaume-charles-edouard-1861-1938.html. Independent professional biography and identity
Portrait of Charles-Édouard Guillaume
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