[TheForge] Ellipse generator?

[Andrew Vida]

Thanks, this is precisely what I was looking for.  Boy is my memory 
shot... I should probably be composted.

xlch58 at swbell.net wrote:
> Here is a simple mechanism for drawing one:
> 
> http://www.physics.montana.edu/demonstrations/video/1_mechanics/demos/ellipsedrawingboard.html 
> 
> 
> The mechanism for describing an elipse in machinery that I have seen 
> consists of two 90 degree intersecting slides with an one arm pivoting 
> on each.  The end of the arm descrubes an elipse.  They are sold as toys 
> called "do nothing machines" one is shown here:
> 
> http://woodenuknow.com/donothingmachines.html
> 
> Charles
> 
> 
> Andrew Vida wrote:
> 
>> Folks,
>>
>> It's driving me nuts.  I cannot, for the life of me, remember how to 
>> put together a mechanical ellipse generator.  They are very simple 
>> devices but my brain just refuses to give it up.  Last one I saw was 
>> at some smithing event several years ago.  For some reason I recall 
>> that Bob Bergman donated it to an Iron in the Hat, but I may be wrong.
>>
>> Anyone have any links or images?  Web search produced nothing that I 
>> could find.
>>
>> Thanks,
>>
>>     -Andy
>>
>>
> 
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