toddh wrote:

On Wed, 7 Jan 2004 16:11:22 +0000 (UTC), Poliisi wrote:

Mount a pump with a rotating nozzle and hit them with a
jet of air. Would also be handy to stir up ground dust for
analysis.

I suspect this would not work. Look at the build-up of dust
on fan blades, and these have a much greater flow of air at
a much greater density.

Keith Harwood.