Painting. John Harrison (1693-1776) / Thomas King, c1767. Oil on canvas; 125x100cm in gilt frame 144.5x120x8cm. - Titled centre l, on chronometer, John Harrison. - Portrait: Sitter nearly TQL seated to L beside table holding in right hand, watch made to his design by John Jeffries 1753. Third timekeeper H3, for ascertaining Longitude, delineated in background L. Chronometrical drawing. l. Invention of compound pendulum, background R.