Monday, June 10, 2013

Shifting Sands...

Watch this:

If this is new to you, there's a brief explanation here.  There's no photographic trickery involved; if you were standing there, you'd see this.

I stumbled across this phenomenon completely by accident when I was in the U.S. Navy.  The ship I served on was made of steel – decks, walls, ceilings, everything.  In one small compartment, about 10 feet on a side, we had a pair of “motor-generators” (MG sets) that converted 60Hz AC to 400 Hz AC to power our computer systems.  The MG sets ran at a constant speed, and served as a source of vibration.  The floor acted like a nice metal plate, with the MG sets right in the middle.  The dirt and junk on the floor acted just like the sand in this video, being bounced around by the standing vibration waves until they wandered into the stationary node lines.  The result, just like this video, was a beautiful “picture” of the standing waves...

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