The contents are as follows: Notebook, 1896, of John Rennie: King's brewhouse, and dock, at Gosport (MS.19915);

Notebook, 1796, of John Rennie: George Bishop's mill at Maidstone (MS.19916);

Notebook, [1784-1818], of John Rennie: Glennie's mill (MS.19925);

Notebook, [1784-1818], of John Rennie: Dunkin and Stibb's mill (MS.19924);

Notebook, [1784-1818], of John Rennie: Brandram and Templeman's lead mill (MS.19923);

Notebook, 1802, of John Rennie: Chambers Broun and Company's paper mill at Aberdeen. (MS.19922);

Notebook, 1800, of John Rennie: Sayce and Kelson's brewery, Bath (MS.19921);

Notebook, 1799, of John Rennie: Oat and barley mills at Larne (MS.19920);

Notebook, 1799, of John Rennie: Flour mill at Invermore near Larne (MS.19919);

Notebook of John Rennie: R and W Were's White leadmill at Garrat, 1799, with notes concerning an oil mill, 1804 (MS.19918);

Notebook, 1798, of John Rennie: Wilke’s oil and cornmill at Dartford (MS.19917);

Notebook, 1815-1816, of John Rennie: Dublin harbour, Waterloo bridge, conversation with Nash concerning the Highgate Archway and the possible construction of a triumphal arch on Waterloo bridge, Leeds and Liverpool canal (MS.19900);

Notebook,1813, of John Rennie: Approaches to Waterloo bridge, Fen drainage, Enfield lock, Doncaster water-works, Tyne estuary at South Shields, dredging machine on River Witham, piles at Chetney Hill in Margate, Endsleigh bridge, Pembroke dock (MS.19899);

Notebook, 1811, of John Rennie: Ramhurst powdermill, Grand Western canal, Gloucester and Berkeley canal, London bridge, Southwark bridge, Liverpool docks, mills at Colnbrook (MS.19898);

Notebook, 1818, of John Rennie: River Cam from Cambridge to Clayhithe, especially the bridges at Cambridge (MS.19901);

Notebook, 1818, of John Rennie: Aberdeen harbour, Ythan estuary, Bridge of Don, Arbroath canal, Isleworth mill, Deeping fen drainage, Yarmouth harbour, Severn at Tewkesbury, Knottingley and Goole canal, Selby canal (MS.19902);

Receipt book, 1802-1814, of John Rennie, containing receipts for money paid by Rennie for supplies, and as wages to his employees (MS.19926);

Notebook, [1784-1818], of John Rennie containing a ready reckoner for the velocity of water, and notes on calculations relating to volume, flow, and weight of water (MS.19927);

Notebook, 1817, of John Rennie containing a table of measures for canal cutting by Samuel Hodgkinson, with a covering letter by Hodgkinson to Rennie (MS.19928).