Figure 5 from Stephen Johnston, ‘Making the arithmometer count’, Bulletin of the Scientific Instrument Society, 52 (1997), 12-21. For the full text, see the main page; for the other online images, see the gallery.
Larger version of figure 5.

Figure 5

Mechanism of the earliest arithmometer (note 7).

By permission of the Smithsonian Institution; photo no. P651074A.

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