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Maurice Davies relates this and the studies on folios 12 verso–13 recto, 17 recto, 19 verso, 20 recto and 31 recto (D07977, D07978, D07985, D07988, D07989, D08002) to Turner’s first perspective lecture, delivered at the Royal Academy in January 1811 (see the Introduction to the sketchbook); Turner discussed the ‘flaming ball’ surmounting the Monument, London, and the distance from the base at ground level from which it could be viewed,1 in relation to his large watercolour diagram ‘4’ showing both the whole structure and the upper stages from below (Tate D17122; Turner Bequest CXCV 151).
As in the sketch of a Gothic archway on folio 44 verso (D08016), Turner has indicated a section of the profile of the moulding at the top of the drum supporting the urn. There is a slight continuation of the present drawing on folio 33 verso opposite (D41526). For further details of the Monument see under folio 12 verso (D07977).
Davies pp.32, 106 note 8; Davies 1994, p.290.