1909
A.J. Finberg, A Complete Inventory of the Drawings of the Turner Bequest, London 1909, vol.I, p.596, CXCV 177a, as ‘177. Glass balls, partly filled with water’.
1980
Judy Egerton [and Clifford Ellis], ‘JMWT PP’: A Selection of Drawings Made by Turner to Illustrate his Royal Academy Lectures as Professor of Perspective, exhibition catalogue, Tate Gallery, London 1980, p.[6], as ‘Glass sphere’.
1987
Thomas H. Coolsen, ‘Phryne and the Orators: Decadence and Art in Ancient Greece and Modern Britain’, Turner Studies, vol.7 no1, Summer 1987, pp.7, 10 note 33.
1992
Maurice Davies, Turner as Professor: The Artist and Linear Perspective, exhibition catalogue, Tate Gallery London 1992, p.53, reproduced fig.52.
1994
Maurice William Davies, ‘J.M.W. Turner’s Approach to Perspective in His Royal Academy Lectures of 1811’, unpublished Ph.D thesis, Courtauld Institute of Art, London 1994, p.265.