The contents are as follows: 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, 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);

Notebook, 1786, of John Rennie: Diggin's mill at Chichester (MS.19903);

Notebook, 1786, of John Rennie: S D Liptrap and Company’s distillery, London (MS.19904);

Notebook, 1786, of John Rennie: Bell, Gosse and Company’s distillery, London (MS.19905);

Notebook, 1786, of John Rennie: Silas Deane's snuff and tobacco mill (MS.19906);

Notebook, 1787, of John Rennie: James Haig's distillery, Canonmills. (MS.19907);

Notebook, 1787, of John Rennie: Aitchison and Brown's distillery, St Clements Wells (MS.19908);

Notebook, 1787, of John Rennie: J T Rutt's drug grinding mill (MS.19909);

Notebook, 1787, of John Rennie: Henry Goodwyn's brewery, London (MS.19910);

Notebook, 1788, of John Rennie: Hankins' cornmill at Ware (MS.19911);

Notebook, 1790, of John Rennie: Johnston and Gould's mill, Brentford (MS.19912);

Notebook, 1791, of John Rennie: Elgar's papermill, Chatford (MS.19913);

Notebook, 1794, of John Rennie: Severn's mill at Whitechape (MS.19914);

Notebook, 1796, 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, 1798, of John Rennie: Wilke’s oil and cornmill at Dartford (MS.19917);

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

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

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

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

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

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

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

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

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);

Notebook, 1793, of surveys (not by John Rennie) for Winstanley's silk mill at Marlborough, and Walthamstow oil mill (MS.19929).