Joseph Priestley by Thomas Holloway after William Artaud, c. 1794, line engraving on paper, from the National Portrait Gallery - NPG-NPG 77 359, William Artaud, circa 1794

Joseph priestley by thomas holloway after william artaud, c. 1794, line engraving on paper, from the national portrait gallery which has explicitly released this digital image under the cc0 license. (https://npg. Si. Edu/object/npg_npg. 77. 359). Date: circa 1794.