The contents are as follows: Notebook, 1798, of John Rennie: Darenth calico ground, Stamswood mill near Andover, Stavertonmill near Bradford on Avon (MS.19862);

Notebook, 1799, of John Rennie: Salisbury and Southampton canal, Huddart's rope machine, Kelso bridge, Simmond’s pump at Reading, Billinge's mill at Twyford, millwright’s wages, Goodives colliery near Coleford in Somerset, Chelmer and Blackwater canal, Wraysbury coppermill, Colnbrook paper and leather mill, Avoncliff aqueduct (MS.19863);

Notebook, 1799, of John Rennie: Canterbury mill, Dover harbour, Logan Rock, Ramsgate harbour, Kennet and Avon canal, Huddart's rope machine, various Hornblower engines in Cornish tin-mines (MS.19864);

Notebook, 1799, of John Rennie: Gardner and Aire's steam-engine at Spalding, Billinge's mill at Twyford, Fen drainage, Friskney wind machine, dredger at Hull, Horncastle navigation, note of conversation with Andrew Meikle at Phantassie, Leith harbour, Saltcoats harbour (MS.19865);

Notebook. 1799-1800, of John Rennie: Whiteadder bridge, Kennet and Avon canal, Lingard and Sadler's oil mill, Simmonds' mill at Reading, Pulteney bridge at Bath, Huddart's rope machine, Fish and Yates' snuff mill, Phillpot’s iron mill at Chatham, Leith harbour, Sandford and Bishop's brick machine, Newbury canal, Leek canal (MS.19866);

Notebook, 1800 of John Rennie: Windmill at Bardney built on Eckhardt's principles, Fen drainage, Datchett bridge (MS.19867);

Notebook, 1800, of John Rennie: Southcott wire mill at Reading, Leek canal, Wolseley bridge, Birmingham canal, Grand Trunk canal, Kennet and Avon canal, Wraysbury copper mill, wells on Croydon common, Uxbridge copper mill, Sayce's maltmills at Bath, Fen drainage, Huddart's rope factory, Union mill at Birmingham (MS.19868);

Notebook, 1800, of John Rennie: Hurley mill, Thames and Medway navigation, Grand Junction canal, Staverton mill, Cowley and Hathaway's mill at Redbrook near Monmouth, Plater's pasteboard engine, London docks, Mortar engine at Limehouse, Fen drainage, Leith harbour (MS.19869);

Notebook, 1800, of John Rennie: Surveys of Boston and Lynn bays, Boston bridge, River Ouse, Wisbech canal, River Ancholme and associated drainage schemes, harbours of Dundee, Arbroath, and Pettycur, embankments on the South Esk, harbours of Montrose, Fraserburgh, Peterhead, and Aberdeen (MS.19870).