Manuel, that's sounds like a tough one. Maybe we could help if you could
give us a little more information.

1. What kind of material are the slates made out of?
2. Are the slates the same size and thickness?
3. Are the slates always stacked at the same level (ie: 1, 2, etc, slates)?
4. Is there any edge of the slates that does not overlap another slate?

   - Tom

At 02:47 PM 4/18/98 +0200, Manuel wrote:
>In a project that I am carrying out should I count a I number uncertain of
>heaped slates some above other, do I ignore the sensor type that could use,
>I have tried to use laser, but is the refraction index very variable, could
>ultra-sounds be used maybe? some idea?
>
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