Prepared in connection with his lectures as Professor of Perspective at the Royal Academy, Turner’s diagram of two triangles within circles – inexplicably inscribed ‘Circles within a Triangle’ – completes Proposition 5 from Book 4 of Samuel Cunn’s Euclid’s Elements of Geometry (London 1759, Book 4). See Tate D17004; Turner Bequest CXCV 34 for the initial portion. Cunn defines the proposition as ‘Problem: To describe a circle about a given triangle’.1 There are sketches of both figures in Turner’s lecture notes.2
Blank, save for an inscription by an unknown hand in pencil ‘13’ bottom left.
Supported by The Samuel H. Kress Foundation