- 1Collection of letters and accounts relating to Richard Trevithick's patent on a portable high pressure steam engine (MS/1944)
1803-1808, fonds - 2Letter from Messrs Blagrave and Walter to Messrs Haynes and Douglas and a copy of a letter Samuel Homfray to Messrs Blagrave and Walter (MS/1944/05)
31st May 1807-3rd June 1807, item - 3Letter from Samuel Homfray to Messrs Haynes and Douglas (MS/1944/08)
23rd April 1808, item - 4Letter from Robert Bill to Messrs Haynes and Douglas (MS/1944/11)
3rd July 1808, item - 5Letter from Robert Bill to Messrs Haynes and Douglas (MS/1944/12)
21st July 1808, item