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The outline to the right of centre, a pediment with a pedestal at its apex, appears to indicate Carlton House, London. The upper part of a column annotated ‘6’ may be one of those supporting its portico, which is shown in another sketch on folio 15 verso opposite (D07983). The significance of the other details is less clear, and they may be taken from other buildings.
Carlton House appears in a large watercolour diagram which accompanied Turner’s first perspective lecture at the Royal Academy in January 1811 (see the Introduction to the sketchbook), showing the whole of the north front with rusticated wings and a colonnaded screen and gateways in front, in which Turner combined a scale elevation with naturalistic shading (Tate D17119; Turner Bequest CXCV 148).1 There are further studies of Carlton House on folios 49 verso–50 recto, 61 verso (D08023, D08024, D08039) and possibly 39 recto (D08011). For the history of the building, see under folio 15 verso.
Ibid., pp.31, 33.