Corrections and clarifications

In our potted history of the development of the computer from Babbage to Windows, page 3, June 5, we said "1820-32 Mechanical computing: Charles Babbage designs the first mechanical computers, the analytical engine (to calculate mathematical tables) and the difference engine which, had it been built, would have been the first computer." We got those the wrong way round. In fact, it was the difference engine, for the calculation of tables, which was actually (although not completely) built during the years 1820-32 (the Science Museum recently completed a working copy of it). Reflecting on his experience with the difference engine, Babbage in 1834 first envisaged the analytical engine, which would have been a truly programmable calculating machine, and the detailed design and unsuccessful promotion of this preoccupied him until his death in 1871.

Our blurb for the Channel 5 programme Naked Jungle, page 24, G2, June 6, suggested, "Keith Chegwin hosts the naked gameshow for naturalists." Naturists, in fact, whatever their interests.

Among the words we seldom spell correctly is Pharaoh (headline, page 19, The Editor, June 2). The internet company Amaze, page 25, June 6, emerged from Liverpool John Moores University, not the University of Liverpool.

Lord Falconer did not go to Queen's College. He went to Queens' College, Cambridge. It is not to be confused with The Queen's College, Oxford. It is a simple matter of the apostrophe.

It is the policy of the Guardian to correct significant errors as soon as possible. Please quote the date and page number. Readers may contact the office of the readers' editor by telephoning 020-7239 9589 between 11am and 5pm Monday to Friday. Surface mail to Readers' editor, The Guardian, 119 Farringdon Road, London EC1R 3ER. Fax 020-7239 9897. Email: reader@theguardian.com
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