Re: Anti-armor mines!

As a further amendment to gravity gradiometers:
In the June 1998 issue of Scientific American, page 58, third column,
first
paragraph, I quote:
    "Some of the resident engineers had thought of using these sensitive
meters to monitor the LOAD of passing trucks, ..."
    My emphasis added.
    A truck weighs 10 - 100 tons? It's load is 10 - 100 tons? A
submarine
weighs 1000's of tons. A minefield is probably 100Kg to 1 ton. A 10 -
1000
difference. It's not much for 200 years of technology advancement to get
the
required accuracy to detect a minefield by it's gravity gradient.

Andrew Martin
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