The contents are as follows: 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);

Notebook, 1801, of John Rennie: Grand Trunk canal, Peak Forest canal, inclined plane at Chapel-en-le-Frith, lime burning at Preston and Chester, cost of stone at Lancaster, navigation of the river Douglas at Tarleton, Standish colliery horse gin, Harecastle new furnace, limekilns at Clough, Leek canal, Wolseley bridge, Caldon canal, Uttexeter canal (MS.19871);

Notebook, 1801, of John Rennie: Croydon canal, Grand Surrey canal, weir at Blairdrummond, Menai straits, Conway river crossing, Perth harbour (MS.19872);

Notebook, 1801, of John Rennie: Harbours of Greenock, Portpatrick, and Chichester, Invermore mill, Larne mill, Menai straits, Swilly bridge, Llanrwst bridge (MS.19873);

Notebook, 1801, of John Rennie: Deptford waterworks, lock at Wapping, engine for Koops and Company's papermill, Chirk aqueduct, Dublin harbour (MS.19874);

Notebook, 1802, of John Rennie: Skating match on London docks when frozen, limestone burnt at Limehouse, Tate's distillery at Thames Bank, Fen drainage, Elstone and Nicholson's mill at Wisbech, Rutt and Jameson's engine in London, Pont Cyssyltau aqueduct, Menai straits (MS.19875);

Notebook, 1802, of John Rennie: Witham navigation, Fen drainage, Division point at Drayton, Bramah's sugar press, Hermitage dock at London, Staines bridge, Koops and Company's Neckinger mill, experiments on the breaking strains of iron rails, warehouse for West India dock (MS.19876);

Notebook, 1802, of John Rennie: Gravesend tunnel, Stacey and Wise's steam-engine at Maidstone, Medway and Rother canal, Teise navigation, London dock, Croydon canal, Huddart's rope works, Glenkens canal (MS.19877);

Notebook, 1802, of John Rennie: Goodwyn and Company's steam-engine, Gravesend tunnel, New river, London docks, London and Portsmouth canal, reservoirs for Grand Junction canal (MS.19878);

Notebook, 1802, of John Rennie: Hull dock, Ancholme navigation, Fen drainage, Witham navigation, Foss navigation (MS.19879).