On Fri, 23 Sep 2011 08:57:56 +0100, Andy Burns
wrote:

polygonum wrote:

And you can happily induce currents in aluminum. Came across this being
used as a brake on huge wide-format digital photographic printers. Very
neat.

Fun with magnets in thick walled copper tube

http://youtu.be/E97CYWlALEs



Totally visually counter-intuitive.

--
Rod