Correspondence of Sir John Frederick William Herschel The correspondence of Sir John Frederick William Herschel, from a larger collection of papers at Observatory House Slough. The collection comprises three main groups of documents. The first is 19 volumes of manuscript letters sent to Herschel, with drafts of his replies (HS 1-19) This includes letters from Charles Rigobert Marie Bonne (25 June 1771-23 November 1829) in vol 4 (HS/4) and Augustus de Morgan in vol 6 (HS/6). There follow 16 volumes of copy letters from Herschel (HS 20-24). These are apparently constructed from Herschel's original letters brought together by a son, Col. John Herschel R.E. for a proposed biography and then returned to their original owners. The biography was never produced. There is some duplication between these versions of finished letters and the rough versions of the same in HS 1-19. The letters are arranged in chronological order in a continual sequence across the volumes. The third group comprises five boxes of unbound manuscript material and 7 previously unbound letter copy books now combined into one volume (HS 25-B28). This material comprises: HS 25, (1 volume and 2 boxes): further copies of letters from Herschel. The letters in HS 25 do not appear to be duplicated in the volumes of copies 20-24 though they cover overlapping periods. The volume is arranged chronologically and includes letters from 1830-1847 (with two letters from 1870). The boxes contain unbound manuscript material arranged in groups by correspondent. HS 26, (1 box): groups of original letters on particular topics, such as Herschel's involvement in W H F Talbot's photography patent disputes, The British Association for the Advancement of Science, and the Telescope Glass Committee HS 27, (1 box): groups of original letters on particular topics, such as Herschel and Charles Babbage's disagreements with Humphry Davy and James South after Babbage's unsuccessful nomination for the position as Secretary of the Royal Society, Babbage's calculating machine, the British Museum and publication of 'Fauna antiqua sivalensis' HS 28, (1 box): information on the copying project including listings of the copies made 1812-1870