The contents are as follows: Notebook, 1784, containing descriptions with many rough diagrams of mills, bridges etc., visited by John Rennie in the course of a journey through the south of Scotland and England as far south as Birmingham (MS.19831);

Notebook, 1789, of John Rennie containing a note of a conversation with John Southern of Boulton and Watt, and of miscellaneous millwork (MS.19832);

Notebook, 1789, of John Rennie: Millwork, Dover harbour, North Foreland light, Ramsgate harbour, Walker's mashing machine (MS.19833);

Notebook, 1789-1790, of John Rennie: Wilsontown railway, Kelvin aqueduct, Symington's engine for dragging boats, Banks and Company's boring mill, Ketley ironworks, Stourbridge canal (MS.19834);

Notebook, 1790, of John Rennie: Littlebury mill, Fen drainage, Bishop’s malt distillery at Maidstone, Birmingham canal, Brierley ironworks, and other ironworks in the neighbourhood of Birmingham (MS.19835);

Notebook, 1791, of John Rennie: New valve made by Boulton and Watt, Marlborough townmill, various papermills in Kent (MS.19836);

Notebook, 1791, of John Rennie: Various works at Wilsontown, Whatman's mills, mines and machinery at Leadhills and Wanlockhead, including a description of a Symington engine. (MS.19837);

Notebook, 1791, of John Rennie: Papermill at Alton in Hampshire, Leeds and Liverpool canal, Royd and Son's fulling stocks, mill for Philadelphia (MS.19838);

Notebook, 1791, of John Rennie: Lancaster canal, note of a conversation with Andrew Meikle about a threshing machine constructed by John Rastrick of Morpeth, boats on the Aire and Calder canal, Crowther and Oldfield's mill at Luddenden, Rawdon's mill at Todmorden, Rochdale canal, Leeds and Liverpool canal, Holywell copper mills (MS.19839);

Notebook, 1791, of John Rennie: Burgess’ mill at Milton, Elgar's papermill at Chatford, Bury canal, Blakey's steam-engine, Godwyn's coal machine (MS.19840);

Notebook, 1791-1792, of John Rennie: Stowmarket canal, Ipswich harbour, Rochdale canal, Shadwell new steam-engine, Lancaster canal, southernmost mill at Dartford (MS.19841);

Notebook, 1792, of John Rennie: Crinan canal, Thurso bridge, harbours at Scrabster, Kiess, Staxigoe, and Wick, mills on the Hempriggs Burn, spring at Taymouth, Glennie's mill (MS.19842);

Notebook, 1792, of John Rennie: Agreement with Goodey, brickmaker in Ipswich, Aylesford bridge, Caine cornmill, Caton silk combing mill, flaxmill possibly at Tatham, Blackhill inclined plane for coal wagons, description of a journey from Oban to Fort William (MS.19843);

Notebook, 1792, of John Rennie: Sunderland's ore mine at Ulverston, Rochdale canal, and a note on the evidence submitted by mill owners on the River Irk with regard to the Rochdale canal (MS.19844);

Notebook, 1792, of John Rennie: Kings Lynn harbour, Old Bedford river, Denver sluice (MS.19845);

Notebook, 1793, of John Rennie: Notes on various mine pumps in the Manchester area and south Lancashire with a view to using mine water as a canal reservoir, Rochdale canal, River Arun navigation, Iver cotton mill (MS.19846);

Notebook, 1793, of John Rennie: Kennet and Avon canal (calculations and notes connected with water supply), notes concerning the sugar trade in London (MS.19847).