Initialy, alternative designs were made for the mausoleum and labelled 1 and 2. However neither was built though the second design provided the basis for a third design that was built. The drawing that shows this is in the Victoria & Albert Museum, one of five drawings for the Bourgeois mausoleum. It is an interior perspective dated 26 August 1807. The main chamber in this design is circular in plan, the lantern has been replaced with a roundel with a dove, and in the burial chamber the three sarcophagi have been arranged around a plinth that is set against the end wall. There are variations in the drawings that follow but the three part plan of a lobby, a circular chamber and a rectangular burial chamber is maintained. Four years later, the Charlotte Street design was virtually reproduced at the Dulwich Picture Gallery
There are five drawings for the Bourgeois mausoleum in the V&A collections see P.du Prey, Sir John Soane, Catalogues of architectural drawings in the Victoria and Albert Museum, 1985, pp. 86-87.
D.Stroud, Sir John Soane architect, 1996,p.32; P.Dean, Sir John Soane and London, 2006, pp.32 and Mausolus, summer 2015, (Mausolus Essay Prize Runner Up) T.Drysdale, 'The Desenfans Mausoleum at Charlotte Street', pp10-17
Sir John Soane's collection includes some 30,000 architectural, design and topographical drawings which is a very important resource for scholars worldwide. His was the first architect’s collection to attempt to preserve the best in design for the architectural profession in the future, and it did so by assembling as exemplars surviving drawings by great Renaissance masters and by the leading architects in Britain in the 17th and 18th centuries and his near contemporaries such as Sir William Chambers, Robert Adam and George Dance the Younger. These drawings sit side by side with 9,000 drawings in Soane’s own hand or those of the pupils in his office, covering his early work as a student, his time in Italy and the drawings produced in the course of his architectural practice from 1780 until the 1830s.
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