- 1Collection of letters and accounts relating to Richard Trevithick's patent on a portable high pressure steam engine (MS/1944)
1803-1808, fonds - 2Statement of payments received by Robert Bill relating to premiums owned by manufactures on Trevithick's high-pressure steam patent (MS/1944/02)
1804, item - 3Letter 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