52. Thomas Spence Duché (Philadelphia 1763-1790 London) Truth reveals itself to Time and Science offices to its children bears a signature 'RWestall' (on the step, lower left) oil on canvas, painted in tondo 40.2 x 40cm (15 13/16 x 15 3/4in). Provenance Private Collection, France Literature A.F. Gegenheimer, 'Artist in Exile: The Story of Thomas Spence Duché,' in The Pennsylvania Magazine of History and Biography, vol. 79, no. 1, January 1955, p. 19 Engraved T.S. Duche, mezzotint, 1780s (see British Museum, acc.no. 1877,0811.1323) The present work, Truth Discovering to Time Science Instructing her Children in the Improvements on the Microscope depicts: Truth as the central figure, Time as the old gentleman with the scythe and Science, seated surrounded by children, with her hands on a globe. It was engraved in mezzotint in 1780s and published as the frontispiece of George Adams Essays on the Microscope in 1787.