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There are two registers of sketches here, showing vessels of various sizes and configurations sailing. At the bottom right, isolated by a pencil border, is a slight landscape form of rocks or a small island, drawn with the page turned vertically in relation to the coastal sketches on folio 13 recto opposite (D18103), which may show Dover Castle.
The yacht at the bottom right is loosely comparable to one in the distance on the right of the painting Cowes Castle, the Seat of J. Nash, Esq.; the Regatta Beating to Windward, exhibited at the Royal Academy in 1828 (Indianapolis Museum of Art).1 For more on studies in this sketchbook relating to the regatta events at Cowes from late July 1827 onwards, see the sketchbook Introduction.
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed., New Haven and London 1984, p.150 no.242, pl.246 (colour).