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Mkey: 1342 Sitter/Title: William Kingdon Clifford Qualifier: reduced replica by Artist(s): John Collier Date made: 1899 Medium: oil on canvas Credit line: © National Portrait Gallery, London Authority data import (Capture): Mathematician, metaphysician, Male, Mathematicians People Authority (Sitters): William Kingdon Clifford Measurements: 23 1/2 in. x 18 3/4 in. (597 mm x 476 mm) Caption: Collier's painting is a replica of his 1878 portrait of Clifford at the Royal Society.