http://en.wikipedia.org/wiki/Foucault_pendulum
I saw one of these in San Francisco as a kid, impressive and educational.
I believe there is also one similar to this at Griffith Observatory in Los Angeles. At least they look similar. :-$
I remember seeing one at the Smithsonian in DC back in '72.
Back then you could drive right past the White House. I remember enjoying the elaborate directions given by the traffic cops near the House, who directed with white gloves, and really got into the motions of directing.
I need this on my desk.
Heh,heh
To keep from nodding off?
Well something that large would keep me awake with fear of being crushed...
I'll bet it has dings from someone trying to use it as a hammer.
James, Did you read the part about Knights Templar?