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			Use a magnetometer. THese are readily available. I would suggst that you strap it onto a wood sleigh and tow the sleigh. Should work. A magnetometer supplier might loan you one free of charge just to see how ell this works.
		 
				__________________ Those who live by the sword will be shot by those of us who have progressed. - M38A1, 67-07800, ex LETE | 
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