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More retro than a slide-rule: the Curta hand-crank mechanical adder. - Adventures in Engineering — LiveJournal
The wanderings of a modern ronin.

Ben Cantrick
  Date: 2008-05-22 00:17
  Subject:   More retro than a slide-rule: the Curta hand-crank mechanical adder.
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  Music:Vernian Process - Queen Of The Delta



http://en.wikipedia.org/wiki/Curta

http://jwz.livejournal.com/889670.html

http://www.curta.org/wiki/CurtaAlgorithms

http://www.curta.de/kr34/curta_simulator_en.htm

Amusing little steampunk calculator. You enter a number using the sliders around the outside, and then turn the crank. The input number is added to whatever number is in the result register on the top. Pulling the handle upwards and turning does subtraction instead of addition. The ring is used to clear the result register and/or the crank count. The band around the top of the body can be rotated, to pre-multiply the input number (and crank count) by powers of ten.

(Am I looking a gift horse in the mouth by saying that you should be able to add by turning the handle clockwise and subtract by turning it counter-clock?)
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Alex Belits: mona
  User: abelits
  Date: 2008-05-25 02:50 (UTC)
  Subject:   (no subject)
Keyword:mona
I couldn't allow myself to miss a chance to comment:

http://jwz.livejournal.com/889670.html?thread=17197638#t17197638
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Ben Cantrick
  User: mackys
  Date: 2008-05-28 05:59 (UTC)
  Subject:   (no subject)
Yeah, I saw. ;]
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