si-national-portrait-gallery: Benjamin Thompson, Count of Rumford, John Raphael Smith, 1801, Smithso
si-national-portrait-gallery: Benjamin Thompson, Count of Rumford, John Raphael Smith, 1801, Smithsonian: National Portrait GallerySize: Sheet: 57 x 42.1 cm (22 7/16 x 16 9/16")Medium: Mezzotint engraving on paperhttps://npg.si.edu/object/npg_NPG.2008.96 -- source link