- Robert and James Adam office drawings
The groin-vaulted ceiling of the great drawing room is included in the second volume of the Works (part 1, plate 5), and is illustrated in accordance with Adam's design (Adam volume 12/144). Adam's preface to this plate reads:
Inside View of the Third and Great Withdrawing-room. The ornaments of the cieling and entablature are chiefly of stucco gilt, with a mixture of paintings. The grounds are coloured with various tints...
Here it is suggested that the ceiling - in both Adam's drawing and the Works - is shown as executed. However, the ceiling was lost when the house was demolished in 1862.
According to Harris, Adam's inspiration for this design came from Giovanni da Udine's painted ceiling in the Vatican loggia, and the Villa Madama, as well as Adam's earlier ceilings such as those for the drawing rooms at Lansdowne House (1967), and Northumberland House (1770).
The Adam office drawing made for the production of plate 5 in the Works was sold from the collection of Edward Croft Murray at Christie's on 9 July 1996 for £49,900.
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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Contents of Preliminary design and finished drawing for the great drawing room ceiling, 1773, as executed (2)
-  Preliminary design for a ceiling for the great drawing room, 1773
-  Finished drawing for a ceiling for the great drawing room, 1773, as executed