John Spink

by Joseph Singleton, after George Keith Ralph
stipple engraving, published 1788
NPG D7838

Sir John Trenchard; John William Hippisley Trenchard

by and published by Charles Bestland, and by Joseph Singleton, after Ozias Humphry
stipple engraving; etching and aquatint, published 18 August 1789
NPG D39286

George Macartney, 1st Earl Macartney

by Joseph Singleton, published by John Sewell, after Ozias Humphry
stipple engraving, published 25 June 1796
NPG D13803

James Wyatt

by Joseph Singleton, after Ozias Humphry
stipple engraving, (1795)
NPG D19320