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Made in connection with Turner’s lectures as Professor of Perspective at the Royal Academy, this diagram of two equilateral triangles is related to sketches in his notes, which suggests that he used it, along with another diagram of triangles numbered ‘3’, ‘4’, and ‘5’(Tate D16998), in later lectures on geometry.1
Turner, ‘Royal Academy Lectures’, circa 1807–38, Department of Western Manuscripts, British Library, London, ADD MS 46151 W folios 2, 4.
Blank, save for an inscription by an unknown hand in pencil ‘6’ bottom left
Supported by The Samuel H. Kress Foundation