Photograph, sepia, portrait, added highlights in ink: Charles Babbage (1791-1871). Image 20x16cm oval, on support. Trimmed to 33x27cm, mounted to board 49x37cm. A leaf inset holograph signature, 6x10cm on card 9x14cm. After the International Statistical Congress photograph of 1860, with sitter's shirtfront and top of chairback touched out. HS to L, vignette. Leaf inscribed in brown ink 'Very Affecty Yours C Babbage Dorset Manch Sq 18 May 1863'. Presented by Major-General Henry Prevost Babbage (1824-1918), youngest son of Charles Babbage. London, Royal Institution; Friday Evening Discourse exhibition (Computing, lecture by Sir Roger Elliott); 1988 5 Feb. Charles Babbage mathematician and pioneer of computing.