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Generally an arithmometer with multiple cogs and stepped drum mechanism, there is however a lot to disassemble.— Dark Roasted Blend
Check out this Russian model of arithmometer, ominously named "Felix" (after Felix Dzerzhiski, founder of Soviet KGB) It was based on 1914 St. Petersburg's Odner-Hill company device, shown on the bottom, click on image for more -— Dark Roasted Blend
n. obsession with numbers, especially compulsion to count things. arithmometer, armiferous adj. - carrying weapons or arms. adj. - like, pertaining to or composed of rings. armillary sphere, celestial globe composed only of rings marking equator, tropics, etc.— xml's Blinklist.com
The differences [Delta] D and [Delta] I are thus calculated, while the values of D (v) and I (v) are obtained by summation with the arithmometer, and entered in their respective columns.— Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
On the way in which this is done, however, depends to a great extent the durability and trustworthiness of any arithmometer; in fact, it is often its weakest point.— Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

Century Dictionary (1)
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