The contents are as follows: Notebook, 1794, of John Rennie: Drawing of Staines bridge, Lancaster canal, Chelmsford navigation, Grand Junction canal, Muirkirk ironworks, Lympley Stoke bridge, various mills on or near the Thames between Staines and Isleworth, Smith's silk mill at Mackney Wick. (MS.19851);

Notebook, 1795, of John Rennie: Kennet and Avon canal, canalboats, Taunton and Bridgwater canal, Taunton and Topsham canal and several of the mills on the line of the canal (MS.19852);

Notebook, 1795, of John Rennie: Fielding's mill on the Calder, Robright's mill at Bromley, note of a contract with Pinkerton and Murray for part of the Lancaster canal, description of an exceptional thunderstorm near Lockerbie, Crinan canal, Kelvin aqueduct, Kennet and Avon canal, mills at Merton and Isleworth, Tamar canal, notes on Morwellham harbour and barges (MS.19853);

Notebook, 1795-1796, of John Rennie: Water supply to the house of Samuel Brandram of Lee, Kennet and Avon canal, Bath navigation, Beddington snuff mill, Dartford gun powder mill (MS.19854);

Notebook, 1797, of John Rennie: Leek canal, Calder canal, Cheddleton flint mill, Hanley and Shelton canal, Uttoxeter canal, Wolseley bridge, mechanism for the Royal Mint press (MS.19855);

Notebook, 1797, of John Rennie: Paper mills (possibly in Kent), MacDougall's threshing mill, Bishop's mills at Maidstone, Newcastle canal, Tamar canal, Thrale's mill, note of contracts connected with the Kennet and Avon canal, Meux's brewery (MS.19856);

Notebook, 1797, of John Rennie: Wolseley bridge, Leek canal, Wilkinson, Baker, and Fisher's mill, bridge on the Dumbarton to Luss road, poem written at Tyndrum, scribbling mill at Kirkstall, Forth and Clyde canal, Leith harbour, Arbroath harbour, Cawood mill, Bramhope mill, Etherington's arsenic mill at Gainsborough, drawing of Gainsborough bridge, inscription on Lune aqueduct (MS.19857);

Notebook, 1797-1798, of John Rennie: Miscellaneous mill work, Thrale and Companys mill, experiments at Wandsworth mill, Benjamin Blodgett's wooden bridge, tunnel on the Salisbury and Southampton canal, Kennet and Avon canal, Lockwood's sawmill (MS.19858);

Notebook, 1798, of John Rennie: Royal Mint, Sir Samuel Bentham's warship, Salisbury and Southampton canal, Kennet and Avon canal (waterflow of Semington Brook), Simmonds' brewery at Reading, Goodwyn's brewery (MS.19859);

Notebook, 1798, of John Rennie: Bath springs, Ketley inclined plane, Wolseley bridge, Leek canal, Gott's mill at Leeds, Pease and Brooks' oil mills at Hull, dovetailed stonework at Fountains Abbey, Kirkcudbright harbour, Duke of Buccleuch's steam-engine at Danderhall, Leith harbour, Hanley steam-engine, Buildwas bridge (MS.19860);

Notebook, 1798, of John Rennie: Leith harbour, Glasgow bridge, Crinan canal, Polton papermill, Bonnington mills, Kelso bridge (MS.19861).