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=== Scheutzian calculation engine ===
[[File:Difference engine Scheutz.jpg|thumb|upright=1.8|Per Georg Scheutz's third difference engine, in the [[Science Museum, London|Science Museum]], London]]
Inspired by Babbage's difference engine in 1834, the Swedish inventor [[Per Georg Scheutz]] built several experimental models. In 1837 his son Edward proposed to construct a working model in metal, and in 1840 finished the calculating part, capable of calculating series with 5-digit numbers and first-order differences, which was later extended to third-order (1842). In 1843, after adding the printing part, the model was completed.
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