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3 letters from Thomas Perronet Thompson of Eliot Vale, Blackheath, London to Professor Augustus De Morgan of 41 Chalcot Villas, [London], 14 Dec 1862. (1-2) Duplicate copies of the same letter, offering De Morgan a copy of the 7th edition of Principles and practice of just intonation (1863). (3) Incomplete letter explaining the duplication: one of the letters had been meant for a Mr Platt; asking De Morgan to tear out the section bearing Platt's address.

All letter are autograph, with signatures.

Letter from Thomas Perronet Thompson of Blackheath, [Kent] to George Pryme, Esq of Wiston, near Huntingdon, 19 Mar 1848. 'For the first time I appear to have got under the fallacy about a paper circulation based on all the land in the country. I just now perceive this included in the latest manifesto of Robert Owen.'

Autograph, with signature.