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Drawn with the sketchbook inverted, this view continues on folio 48 verso of the sketchbook (D06814). The view is westwards towards London, from the slopes rising to the Observatory; a similar view is on folio 48 (D06815). Turner may have used these sketches for the working drawing (Tate D08228; Turner Bequest CXX N) for his 1809 picture, London (Tate N00483).1
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed. 1984, pp.69–70 no.97 (pl.104).