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Originally Posted by Jens Nordlunde
Ariel, it is an interesting experiment you have made.
When reading the description the old travelers give they are a bit loose, as to how the chain 'trick' was made, so it may have been as you say, the chain was wrapped around the trunk - an armoured trunk so to say.
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I learned the art of constructing an experiment from my mentor and the stories about Enrico Fermi: make it simple, stupid:-)
During the first test of atomic bomb Fermi stood some kilometers away from the explosion site with pieces of torn paper in his fist. He raised his hand and opened his fist at the moment of the arrival of the explosion wave : the paper pieces flew away. He looked how far away they flew, made a couple of calculations in his head and announced the power of the explosion. His answer was >10 kiloton. Actually, it was 18.6.
He was famous for his power of estimation of unknown phenomena using intuitive information. His most famous question to Ph.D. candidates in physics at the University of Chicago was: how many piano tuners are in Chicago? No Yellow Pages were allowed.
I learned a lot from these lessons, but still wish I was half as smart.....