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Letter from Charles Babbage of Dorset Street, Manchester Square, [London] to M Sylvain van de Weyer [Belgian ambassador in London], 29 May 1837. Presenting a copy of his book 'The Ninth Bridgewater Treatise'. Autograph, with signature.

Letter from Charles Babbage of Dorset Street, Manchester Square, [London] to an unknown recipient, 8 Nov 1850. Giving directions for meeting Babbage on Wednesday at 7 o'clock. Autograph, with signature. Last leaf only of a letter written on several sheets.

A collection of letters from Jean-Baptiste Biot and his grandson-in-law F Lefort, to Augustus De Morgan,1855-1863. Including related papers. Many of the letters refer to an article by Biot on Sir Isaac Newton in the Biographie Universelle.

Letter from Ernest Clarke of the Royal Agricultural Society of England, 13 Hanover Square, London to [Herbert Somerton] Foxwell, 29 Jul 1897. Mainly discussing the 17th-century writer Samuel Hartlib.

Autograph, with signature.

Letter from the Countess Vernède de Corneillan of 46 (ancien) rue de Rivoli au coin de la rue Castiglione, Paris to [Charles] Babbage, 10 Sep 1854. 'Monsieur Babbage m'a fait passer la lettre que vous avez eu la bonté de lui écrire au sujet d'inventions de M. [Philippe] de Girard … Je prends la liberté de vous récrire a çe sujet, car cette affaire est d'une haute gravité pour notre famille … Vous dites …que le "moyens de M. de Girard sont ingénieux mais que le même effet a été produit par des moyens plus simples, et tellement analogues qu'il me serait difficile de prendre un brevet"'. Saying that if this sentence concerns 'les greniers à blé', she would like to ask certain questions: (i) whether the process analogous to that of Girard is patented in England; (ii) under what name; (iii) at what date and since when; (iv) what are the differences that make it simpler and what are the things analogous to it? Excuses her importunity on the grounds of the matter's important to the memory of her uncle.

Autograph, with signature.