Sounds like the ancient Chinese Compass Cart.



Jerry Fochtman wrote:
> Some of you may remember an HPWorld conference keynote address given by
> Dean Kamen...the inventor of the Segway.   At the end of his 
> presentation he
> unveiled another mechanical device which he brought that was a 
> miniature working
> model of a wagon whose design was quite old.   It's purpose was to keep a
> cannon pointed in the same direction regardless of the direction of 
> movement
> of the wagon.
>
> Does anyone recall anything about this (name, inventor, etc.) as I'd 
> like to try and
> find a picture? 
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