http://www.vintagecalculators.com/html/addometer.html
My Grandfather had one and used to let us check our homework with it. It didn't do more than add or subtract, but it was a neat toy.
Added: The one I want is the Curta (http://www.darkroastedblend.com/2008/09/stunningly-intricate-curta-mechanical.html). I've seen them used, but never used one myself.
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Like the Addometer?
Moderator Posted by NickNielsen
Updated - 16th Feb 2012
