Difference engine
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 The London Science Museum's difference engine, built from Babbage's design. The design has the same precision on all columns, but when calculating polynomials, the precision on the higher-order columns could be lower. The Engine is not a replica (one was never built during Babbage's lifetime); therefore this is the first one - the original. |
A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. The name derives from the method of divided differences, a way to interpolate or tabulate functions by using a small set of polynomial coefficients. Both logarithmic and trigonometric functions, functions commonly used by both navigators and scientists, can be approximated by polynomials, so a difference engine can compute many useful sets of numbers.
- See also: Wikipedia, Wikisource, Commons
- Related: Antikythera mechanism, Ada Lovelace, J. H. Müller, Pinwheel calculator, Per Georg Scheutz, Martin Wiberg
| The Computer History Museum exhibition on Babbage ... The Computer History Museum exhibition on Babbage and the difference engine www.computerhistory.org/babbage/ - Web |
| Babbage Babbage www.sciencemuseum.org.uk/onlinestuff/stories/babbage.aspx - Web |
| Meccano Difference Engine #1 Meccano Difference Engine #1 www.meccano.us/difference_engines/rde_1/ - Web |
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| Meccano Difference Engine #2 Meccano Difference Engine #2 www.meccano.us/difference_engines/rde_2/index.html - Web |
| Difference Engine in Lego Difference Engine in Lego acarol.woz.org - Web |
| Difference engine workings with animations Difference engine workings with animations satyam.com.ar/Babbage/en/index.html - Web |
| Difference Engine No1 specimen piece at the Powerh... Difference Engine No1 specimen piece at the Powerhouse Museum, Sydney www.powerhousemuseum.com/.../?irn=150269&img=146773 - Web |
