- 1Notes on Mr. Braithwaite’s Low Pressure Engine and the Rocket (TREVF/3/17)
c 1829, item - 2Copy Letter from Richard Trevithick to Mr. Gilbert Regarding Marine Propulsion (TREVF/4/23)
14 May 1832 (date of original), item - 3Copy of a Memorandum by Mrs. Guilmard Regarding Richard Trevithick’s Steam Engine (TREVF/4/135)
1808 [date of original], item - 4A letter to Richard Trevithick from Davies Giddy regarding Trevithick's results from his first trial of the Herland pole steam engine (MS/0347/6)
15th February 1816, item