| | SEP: The Modern History of Computing (Site not responding. Last check: 2007-10-31) |
 | | The Swedes Georg and Edvard Scheutz (father and son) constructed a modified version of Babbage's Difference Engine. |
 | | Three were made, a prototype and two commercial models, one of these being sold to an observatory in Albany, New York, and the other to the Registrar-General's office in London, where it calculated and printed actuarial tables. |
 | | Professor Hartree … has recalled that all the essential ideas of the general-purpose calculating machines now being made are to be found in Babbage's plans for his analytical engine. |
| www.science.uva.nl /~seop/entries/computing-history (6955 words) |