Andy, this topic has come up before. I think it was Tjaart (Gawd I
wish he would come back to the this list...) where he was measuring
the level of a local river.

   The recent issue of Sensor Magazine has an article on the principles
of level measurement. Another good resource is the Omega book set which
is normally free. In particular, the "Flow and Level Handbook". I'm an
old Air Force guy so submarines, and ejecting from a perfectly good
aircraft, is a `foreign concept' to me ;-)

      http://www.sensormag.com
      http://www.omega.com

   - Tom

------------------------------------------------------------------------
Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs ;-)

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