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        John William Strutt, 3rd Baron of Rayleigh, British physicist.
        Image is from "Obituary Notices of Fellows Deceased," Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character Vol. 98, No. 695 (Mar. 24, 1921).
        
         
        
        
         
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          This media file is in the  public domain in the  United States. This applies to U.S. works where the copyright has expired, often because its first  publication occurred prior to January 1, 1923. See  this page for further explanation. 
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