A collection of letters and accounts acquired by Bennet Woodcroft relating to Richard Trevithick and Andrew Vivian’s 1802 patent on high pressure steam engines. Included are accounts relating to the premiums owed by companies producing such engines as well as an account of the expenses incurred in promoting them. There are also letters between Samuel Homfray, Robert Bill, Blagrave & Walter, and Haynes & Douglas relating to the patent.
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