Electromagnetic Coin Shrinker

larry cottrill · Post by **larry cottrill** » Fri Jun 19, 2009 5:15 pm

If this has been posted before and I just didn't see it, somebody let me know.

High current electromagnetic coil that instantaneously compresses a US quarter to about the size & volume of a dime:
http://intellectualventureslab.com/?p=71

You have to watch closely; this happens kind of fast. They show a bunch of high-speed photos, but the before-and-after still is the visually interesting part, to me. As explained here, it takes a heck of a current to make this work.

L Cottrill