oo Clodoveu Davis

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===== Mechanical calculators: Original Odhner model 227 =====

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This machine was manufactured by Odhner in Goteborg, Sweden, somewhere between 1955 and 1968. It was my first mechanical calculator, a gift from my wife's cousin, in December 2009. It was all locked up, but disassembling the cover and trying to understand its workings quickly got me to unlock it. Lubricating and cleaning without disassembly, I got it to work smoothly. It is only missing the handle of the accumulator reset crank, and the button of the backtransfer mechanism. 

I have no pictures of the insides of this machine, and no plans to disassemble it, since it is in such a good working condition. I would like to restore the exterior, but I tend to let it stay as it is, with all the apparent wear from many years of use.

**Have a mechanical calculator stored somewhere, and want to get rid of it? Send it to me!**

**1955-1968 Original Odhner model 227 s/n 820036**

{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/OO/oo1.jpg?500 | Front}}

{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/OO/oo2.jpg?500 | Back}}

{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/OO/oo3.jpg?500 | Bottom}}

{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/OO/oo4.jpg?500 | Serial number}}

**More about this machine**

[[http://www.youtube.com/watch?v=LghScXcX-SI|Calculating a square root in an Odhner 227]]

[[http://www.rechenmaschinen-illustrated.com/pictures_odhner.htm|Odhner machines history and models (1)]]

[[http://w1.131.telia.com/~u13101111/odhnermod.html|Odhner machines history and models (2)]]

[[http://public.beuth-hochschule.de/~hamann/odhner/index2.html|Operation]]

[[http://home.vicnet.net.au/~wolff/calculators/Tech/OdhnerPinwheel/OdhnerPinwheel.htm|Technical description of the Odhner pinwheel mechanism]]

[[http://www.caltapippo.it/odhner_pan.htm|Manual of the Original Odhner 227 and other models (in Italian)]]

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oo.1360693177.txt.gz · Last modified: 2013/02/12 16:19 by clodoveu

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