This slight but carefully observed sketch of a forge is largely obscured by pencil offsetting from the lengthy inscription on folio 3 verso opposite (D08287). The characteristic profile of an anvil, its conical horn projecting to the right, can just be made out towards the bottom left. There is a much clearer view of the same interior from a different angle on folio 5 recto (D08290). As noted under folio 8 recto (D08295), the studies may relate to the painting A Country Blacksmith Disputing upon the Price of Iron, and the Price Charged to the Butcher for Shoeing his Poney, exhibited at the Royal Academy in 1807 (Tate N00478).1
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed., New Haven and London 1984, pp.52–3 no.68, pl.78 (colour).