Engraved by W Pyott, after Carl Frederick van Breda, 1759–1818, Swedish (painter).- The Benevolent Effects of Abolishing Slavery, or the Planter instructing his Negro. Published June 1792 by W. Pyott, N. 90, Great Titchfield Street Oxford Road, London. Yale Center for British Art, Paul Mellon Fund, Accession Number : B2010.14.