1862: Diagram of the Thomas de Colmar arithmometer mechanism.1
(Source: Museum of the History of Science, University of Oxford.)
1 Franz Reuleaux, Die Thomas’sche Rechenmaschine, Freiberg, 1862 reproduced in Reuleaux’s article in Der Civilingenieur, 8, 1862, and reproduced in turn by Stephen Johnston, “Making the arithmometer count”, Bulletin of the Scientific Instrument Society, Volume 52, 1997, pp. 12–21., see figure 2. (↑)
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