File:Demonstration model of Babbage’s Difference Engine No 1, 19th century. (9660573663).jpg

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Description This model of Difference Engine No 1 was built by Henry Prevost Babbage (1824-1918) from the designs of his father, British computing pioneer Charles Babbage (1791-1871). This was one of approximately six demonstration models of the calculating mechanism of Engine No 1 built by Henry after his father's death, using unused parts from the original. Charles Babbage conceived the idea of building an automatic calculating machine which would eliminate the inaccuracy that occurred when compiling mathematical tables by hand. Never built during Charles Babbage's lifetime, it was a decimal digital machine - the value of a number being represented by the positions of toothed wheels marked with decimal numbers.
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Demonstration model of Babbage’s Difference Engine No 1, 19th century.

Author Science Museum London / Science and Society Picture Library

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This image, originally posted to Flickr, was reviewed on 3 September 2013 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date.

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Date/TimeThumbnailDimensionsUserComment
current06:16, 8 September 2013Thumbnail for version as of 06:16, 8 September 2013878 × 840 (463 KB)DrJunge (talk | contribs)tilt further reduced
09:31, 7 September 2013Thumbnail for version as of 09:31, 7 September 2013878 × 840 (463 KB)DrJunge (talk | contribs)white balance adjusted, deslanted, denoised, cropped.
10:25, 3 September 2013Thumbnail for version as of 10:25, 3 September 20131,250 × 982 (197 KB)File Upload Bot (Magnus Manske) (talk | contribs)Transferred from Flickr by User:Mrjohncummings

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