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Hi,

We're trying to find a way to measure the speed of something like sand
as it flows down an inclined plane.  We were thinking of maybe trying a
radar gun at the bottom of the plane pointed up at the sand, but we're
kind of concerned about it...well, not working.  Does anyone have any
experience with this type of thing, or have any suggestions?

Thanks,
Phil 
Museum of Science and Industry, Chicago

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