Another Mechanical Calculator
This video demonstrates the Original Odhner mechanical calculator.
http://www.youtube.com/watch?v=Bz8_tNDUDog
It looks like a miniature typewriter, and it seems to operate in the same manner as the Curta mechanical calculator: switches allow you to “input” numbers into the machine, and then turning a crank performs addition or subtraction.
The video demonstrates some basic operations of the Odhner, and it includes a nice (if lengthy) computation of the square root of 2 that involves a few arithmetic tricks.
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